Valve is privately-owned with its BDFL owning over half of it. It has never gone through a leadership transition. It could relatively quickly go entirely bad after Gabe Newell is gone.
Shit, I'd take it. Sideloading, custom OSes, less-wimpy legal chops against hackers... Valve could turn Apple around.
A 5 year release cadence would incentivize the iPhone to change something more significant than just the price tag. And Proton would give me my first justification for a owning a powerful phone.