not OP but i'd like to chime in,

pretty much yes to all of these,

You're always going to have preference towards specific tasks, you have to learn to say no to them and start making that sacrifice in order to tackle the tasks you're otherwise 'avoiding', that avoidance could be a form of cognitive anxiety in that you're uncertain about your ability to perform, or otherwise have little to no enjoyment in it, which is pretty much most forms of work! they don't call it work for no reason ;)

That avoidance could also be a result of being too BLIND to them in the first place, out of sight out of mind, what's the best way to put a 'task' out of sight mentally? distracting yourself by engaging in something you have a stronger preference towards. I find that with my medication, i'm very aware that i'm doing that specifically when I do it, it doesn't make those tasks less enjoyable or tempting, it's just like an increased level of self-awareness which gives me a fighting chance of not becoming blindsighted mentally by them, but it still requires the utilization of this and breaking away, saying no to it, in order to regain a more clear vision of what I am avoiding; where as without the medication, it was almost like a complete autopilot, day in day out

Medication's benefits can ONLY be maximised, more or less, adequately utilized with precision in the first place, if you know the in and outs of what exactly it does for you at a cognitive level, this unfortunately takes time, and can often even be somewhat 'forgotten' and questioned, I find my self questioning whether my meds are still working more often when i'm not really utilizing their benefit, and that in itself can become a distraction; but how do you answer the question of "are they working?" and there's only one way really, by approaching the question not through thinking, but through ENGAGING in something where you expect to see them being beneficial

think about that for a moment, is questioning whether the meds are actually helping a sign of the meds not working, or is it just a result of you not utilizing them properly, dwelling on what they're SUPPOSED to do for you, as opposed to what YOU'RE supposed to do with their help

that hammer analogy, is questioning whether the hammer can actually hammer in nails, whether it's big enough or not, going to answer the question any better than simply using it as intended in order to find out?

Persisting inability to work ties back into those kinda ideas, you're not incapable, it's entirely possible that without medication you won't stand as much of a change, or that with medication you may not be dosed right, but the truth is, you need to approach those first two ideas correctly in order to determine what's going on with the 'persisting inability', where that persistence originates, why you feel unable, are you absolutely CERTAIN you are unable to do said task(s)? what actually goes on when you approach that task and challenge yourself, do you just avoid it without engaging due to stronger preference towards something else? are you getting blindsighted? if so is it because you allow yourself to be blindsighted (question one) or is it because you're not familiar with what the medication is supposed to do and doubt their effectiveness (question two) if the inability is neither of those, then it's possible the medication isn't quite dialed in properly, but baring in mind, the medication will NOT make you do those tasks, it will not do those tasks for you, and it won't make you automatically compelled to do them, you're not a robot that can be fine tinkered to do what you don't want too, you have to utilize executive functioning to actively engage in it through correct approach and mindfulness, and that's largely where ADHD issues originate!

basically, with that kinda stuff in mind, in regards to executive functioning, what medication offers when dosed correctly, is simply that, it doesn't provide you the 'ability' to do tasks any more than you are already capable, and you may be incapable due to not knowing how too, but you've always been capable of learning (I mean, you learned to tie your shoes, right?),

it doesn't make tasks immensely more enjoyable or automatic engaging, it allows YOU the executive functioning to maintain self-awareness, to actually tune out distractions and focus on what you intend to be doing, to question your self, to challenge yourself, to push yourself, to make decisions against pure impulsive preference,

that's a bit of a vague statement as medication does a good deal of other things with it's peripheral effects and that in it self, while being the intended benefit, isn't enough to really 'solve' the disorder due to strong habits, but really identifying what it specifically does, right at the ROOT of the issue, is crucial in order for adequate utilization, otherwise you'll just go on using the medication but never really quite grasping and taking advantage of what it actually offers, at best, it'll make those things you already engage in slightly more enjoyable and engaging due to having more self-awareness of your capabilities/enjoyment of said task, feeling 'smarter' or more 'present' while engaging with them, even possibly performing better, but still living on autopilot and doing what you've always done.

Get to know the medication, get to know yourself and what it does for you, and you'll have the answers as to what you can do with it, at the end though, the choice is still ultimately yours

-long pedantic wall of text, but it was a fun exploration of mind and medication