I have to disagree with that. Some devs grow alongside a publisher like GG and suckerpunch did. And buying them would allow them to grow and be fully dedicated to the platform, as well as allowing long term expansion. A studio like playground games made sense for the purchase, do did undead labsIf a studio would otherwise go under, then fine. If a studio almost exclusively just works with one first party then that's also fine.
But both among Xbox and PS fans you are now seeing more and more people hope for those companies to buy developers that are already hugely successful as multiplat devs, even publishers are thrown around.
With Xbox especially, the community has basically completely accepted that as something that consumers should desire, since MS decided to turn corporate acquisitions into a marketing circus.