While I think theres probably an argument for it being hard to learn fights, I think making the argument ‘you cant learn boss fights’ followed by a reasoning for this being ‘well you have to clear the dungeon again to get to it’ is just inherently flawed.
Either you cant learn the boss fights, and no matter how easy it is to retry it you still wont, because you cant learn the boss fights. Or you can learn the boss fights, and you’d personally prefer it be less of a grind between each attempt.
I’ve personally learnt all the boss fights, thats my personal experience. There can defintiely be points made towards how punishing it is in terms of time needed to get to the boss again when you make a mistake, but its just clickbaity rubbish to lead off with ‘you cant learn them’.
Also, no offense, but i see in a comment you make the point that you haven’t killed t4 bosses. I’m not sure you can comment on the difficulty of learning bosses in the way you are, i.e. seemingly trying to be objective about it. When you haven’t gone through the entire thing (i.e. learnt the bosses enough to do them on t4). Knowing that you haven’t actually done them it makes your points make a lot more sense however, as your points clearny aren’t ‘i can’t learn the boss fights, so i have to overgear my way through them’. But instead ‘I haven’t learnt the boss fights, so I have to overgear through the first 3 tiers, and now I can’t do tier 4 bosses because I haven’t learn them, and overgearing them requires beating them first’
Now that’s definitely a good point, if you never actually try to learn the fights, or just play the game outside of bosses enough beforehand, you’ll be in a position where you actively have to make the choice to learn the fights so you can do them. And if you don’t make that choice, the games only going to offer you that opportunity, when you’re pushing t4.
However I think it’s fair to say that this design is perfectly fine, it’s more accessible this way than the game forcing that on you.
((A good comparison of this with other games, wow for example, is that if you just ignore mechanics in a normal raid because you overgear it, you then get to that boss on heroic and have a much harder time progging through it, than if you purposefully bring attention to the mechanics in normal, so your raid can learn them in a situation where learning doesnt have the same risk as on the higher difficulties))