The reason why people like exclusives is because the studios that make them are usually the best talent in the industry that is getting funded and given long development cycles to make the best game they possibly can, because the game is not just any game, it's a showpiece for the console.
The only time this even comes into play is when its a studio that has no history of doing multiplatform, suddenly doing multiplatform. Maybe that could have been a better thread.
I'm more likely to play a 3rd party game by a studio that has a strong history of doing that well. Just cause its on a platform I own, doesn't mean it will play well on the platform I own lol So it really depends.
A game being exclusive to one console or another does not make me want to play it more or less. Is it a good game? If so then I will eventually play it, no matter what the console is.........
If I wanted to play it and it comes to my platform I'm going to play it all the same. I won't be passing on a game out of putatively solidarity for people who start crying when a former exclusive is announced for another platform years later.
The only reason they have appeal is because platform holders push marketing for exclusives to sell their platforms. That and console warriors use them in list wars so they get even more exposure. Console fans in general couldn't care less if a good game is exclusive or not.
Tomb raider was announced as coming to every platform. Even preorders went up for PS4. Then at Gamescom closer to release suddenly announced as a timed xbox exclusive and preorder pages were taken down.
Starfield was also announced but without mentioning any platforms. Then it became exclusive closer to release.
I don't think the OP even mentioned a "last minute" change. He said "1 year before release" in his example.