you're not wrong. i think you're right in saying that sony would also follow suit eventually, and xbox and playstation hardware will be more akin to ios vs. android, where you pick your ecosystem and can largely expect content to be ubiquitous.
On theory and in most cases and times it wouldn't matter.
As I keep pointing out MS is already multiplat; Bethesda, ABK, and (on ocassion) XGS.
But...
SEA OF THIEVES is a bad choice to bring to Playstation becuse as an *established* XBOX/PC online game, it has a community identity built around those platforms. Nintendo I could understand since RARE is a name that community is familar with and has fond memories of their past games. And the ABK deal is bringing good things to that community.
But Playstation, especially in 2024, is not a good fit as a portion of that community is visibly and vitriolicly against XBOX and to a lesser degree PC for losing their COD privileges moving forward. They may not be many but if iadded to SEA OF THIEVES will be trouble, there will be bannings, there will be drama.
If MS is to take advantage of Sony's 2024 game...drought...it should be with single player games where the bad blood between the communities can't impact the business. That the bad blood does exist is undeniable: witness all the bad mouthing of STARFIELD (you did see the METRO pieces?) and the ongoing angst that even the rumor of *one* XBOX original coming to Playstation is causing? (40+ comments to the mere rumor?)
Part of it is the internet being the internet but the discord between the communities is real right now. (Sony's role and tactics in trying to stop the ABK deal won't soon be forgotten.) Rationality does not factor in it.
MS doesn't need the drama.
(Some customers aren't worth the money they bring.)
Not at this time and not in an established community game.
Maybe a different game at a different time.
Good thing this is most likely a made up rumor.