I'd be all in for actual hard bosses like what you have in mind. I just don't really believe Mihoyo is capable of making fights like this. IMHO the only 'good' boss fight in the whole game is electro hypostasis - obviously it's as faceroll as all the others, but it's the only fight with consistent mechanics. Though I definitely hope the new boss turns out to be better than the ones we already have. I guess if it's at least a slight improvement, there will be some hope for the future.