Hey hey! I love your compilation post! Ultimately, I think all of these improvements would make the game better for all of us as players. However, I think it is optimistic, and not focused enough for MiHoYo to prioritize and listen to seriously. We, being as demanding as we are, are also not considering the creators behind the game as much as we could be. MiHoYo is a game company: and as a company, their main goals are to retain players and make a profit. A handful of these suggestions would help the former but hurt the latter. It's a delicate balance.

As for prioritization, a lot of these issues are actually large whereas a bunch of them are menial by comparison. Compiling them together makes MiHoYo more likely to see them as a package deal and discredit the importance of some while overstating the importance of others.

Account Security and 2FA by and far exceeds the other issues in importance. Having an account you put so much time and money into get stolen from under you is just heartbreaking, and frankly, inexcusable. We shouldn't even have 0.01% fear that our accounts being stolen is a possibility. I think a few other major points you brought up that they should focus on are repeatable endgame content for hardcore players, playable character world/sidequest inclusion, and daily login rewards. These three points actually help them further their goals (player retention/profit/hype) as well as give us things that we'd like (free resources/content/character development). However, while daily login rewards dont take much work aside from fine tuning, extra endgame content takes a lot of resources to create on their part. Even adding characters to the world does, from a writing standpoint, because they'd have to make sure the character dialogue is consistent with where these world quests can be weaved into story quests/sidequests. However, on these 4 points, I'm pretty sure everyone from both sides can agree on their inclusion and that the work will be worth the long term rewards. These suggestions are what we should start by requesting, as opposed to dumping a huge list on the company.

Then you have issues that are really menial (or unrealistic/controversial) by comparison. A training room, a character friendship system, the QoL changes, and a revamped resin system. These things take a lot of resources on MiHoYo's part to do, with little to no gain for them. Only a small subset of very dedicated people would use the training room consistently, the QoL changes arent making or breaking anyone's decision to play the game or spend money, and Resin is likely a major point of profit, and a good way to retain players, for MiHoYo. Now, it pains me to say this, because god I'd love a character overworld friendship system, but that's a ton of work and would require a massive update to achieve exactly what putting them in the world would achieve, for less work.

There are also some things here I'm really not sure on. Artifact RNG is terrible for us as players, however, it's also a huge resin dump (or money dump, for whales). If they did introduce reforging, I think they'd make it cost resin, or a resource that requires you use resin to farm. Which is a major disappointment. I feel the same way about a resource exchange system, however, they could circumvent these issues by making reforging require dupes and transmuting at a 3/1 ratio. That way, they still get people dumping resin (or money) into mats/artifacts while still not making it stupid time consuming for us to achieve what we need to. Fixing up artifact and drop rng like this would also erase most people's complaints about resin.

I'm just a lady who plays lots of gachas, so my opinion is definitely far from informed or even solid. However, I think that, as players, we have a responsibility to come to a compromise with the developers and not only tell them what we want but also give them reasons why it'd be good for them long term. I also think tackling 1 issue at a time is more likely to be recieved positively by MiHoYo. I believe we should start with Account Security, personally.