Exclusive content beyond maybe costumes is total trash. It was a bad precedent set last gen and it just gets more annoying as time goes on. As far as developers that were formerly exclusive, with Xbox it's very clear that the smaller userbase affects sales pretty strongly. (See Ryse, Sunset Overdrive.) If you're doing an exclusive game it makes much more business sense to do so with Sony than MS currently, and I imagine with all the studio acquistions, money for this kind of thing isn't as much of a priority unless they think it's a homerun.
Even before this we can probably still assume this mind set is being used, to focus on their own IP rather they paying to fund exclusives.
As for those that we're one time console exclusive and are going multiplatform, it makes much more business sense unless you are getting an insane amount of money paid by Sony/MS/Nintendo/Epic to go exclusive. This is not just a phenomenon with Xbox developers, as Sony had both Quantic Dream (Detroit: Become Human, Beyond: Two Souls, Heavy Rain) and SuperMassive (Until Dawn) jump ship in the past year.
Yea, it makes sense to go multiplat, I'm not arguing with that. It just seems like PS gets all of Xbox's old exclusives to turn + give them exclusive content, rather than a simple announcement that they plan to release multiplat. Meanwhile, MS can seem to entice very few of the PS exclusive titles to the Xbox ecosystem even as a simple equal multiplat publication. What gives? Obviously money and I'm not sure MS has their priorities straight.
What developers? You realize the publishers are the ones making these deals, right?
K. The past two gens, all Remedy games were published by MS. So tell me how Remedy didn't have anything to do with the publisher change? Bungie ran into the arms of evil Activision and sold their souls with the terms of the Destiny deal as soon as their prior contract obligations with MS were fulfilled. So I'll ask again, why can't MS seem to retain good developers? The simplest answer is because they make shit deals.