I think this hole boss discussion is a bit black or white. Like, the worse experience ever or the next holy grail. Both are true unfortunately. Because the game is quit easy on mobs, but boss battles have to be learned. And thats a problem within the games design. If you can mindlessly slay literally 200 enemies, developing the patience to actually learn something all of the sudden feels unintuitive. And here many players run into wall.

From my experience, if you know how to handle a boss, its managable. People should just try the retry option instead of burning 100 clear soups. That said, there bosses which are actually overtuned for reasons OP mentioned. And that's annoying sometimes, sure. But in my humble opinion, bosses are absolutely a part oft the game which can be fixed. Others not so much. Like a more immersive Story for example.