I can see the use case for someone who wants a single OS install on the Steam Deck that does gaming just about as well as SteamOS does, but has a more fleshed out desktop experience (or even just a different one). The linked article goes into detail on various desktop-focused developments within Bazzite that wouldn’t really make sense for Valve to prioritize in SteamOS itself.
My hope, though I’m keeping my expectations low, is that since these supposed live-service games will be supposedly releasing alongside remakes of the original games the IP is based on, that if the remakes sell significantly better than the live service games it might hopefully inform better decision-making around them.
While they haven’t been controversy-free in terms of their monetization practices, Sega has released a slew of back-to-back AAA games: Persona 3 Reload, Like a Dragon: Infinite Wealth, and Sonic Frontiers, that have generally been complete, single-purchase packages (with a few questionable omissions from base game moved to DLC that I’d consider “regular bad”, but not anywhere near the level of egregious monetization seen in most live-service games).