You know, I've never really minded palette swap/reused boss models as long as they have a unique moveset and are in a different arena. To me, the arena and moveset are what makes up a boss, not what his model happens to look like. I would prefer fresh models but not that big a deal. Especially if there are lore reasons why I am fighting a variation of a boss that already exists, I usually like that a lot because it ties the story together.
On the other hand, same model in the same arena with the same moves, I wouldn't be able to handle that. (not sure where
falls in the spectrum, just voicing my own general opinions)
On the other hand, same model in the same arena with the same moves, I wouldn't be able to handle that. (not sure where
blue smelter