BIS means it's the best available item for its item slot for a particular activity, even if it is niche. Warrior/tyrannical/treasonous might be very niche, but they are still the best at some things. Treasonous is basically useless as far as I know, but theoretically I believe it would be BIS in a heavily cannon based task that involves using a stab weapon. But the other rings are undeniably very useful.

False, berserker ring out-dpses them all.

What? So it's needed to imbue slayer helm and main rings, it's the fastest melee xp in the game, it's afk, and it's profitable... and there aren't that many incentives? Mate how good do you want minigames to be? About the profit, my point isn't that it's some great money maker. It's not. My point is that you're getting great xp rates with 0 effort, and on top of that you're making money. That's unhealthily strong; training methods are supposed to have balance between xp, gp, and effort required.

False, if you're doing it with Dharoks (best melee xp) you're not making money though. You need to pay for repair, 26k each time you enter and then spend a lot of your points on absorb and OL potions. And you have to flick 2x health constantly so you can't afk if you want the max xp method.

What are you getting at here? I never suggested slayer points should be used to imbue items, all I did was disagree with you that "There's hardly any reason to do nmz", which is just stupid, nmz is very powerful contention

False again, I didn't say that. I said there's hardly any incentive if they remove the slayer imbue. There's the rings, that's it.