The problem is that 3rd parties are doing the packaging both on Snap and Flatpak whereas if they had followed proper security practice ONLY THE REAL DEV should ever be allowed to package their app as a Flatpak or Snap.
This would ensure security, as well as a proper functioning flatpak/snap and also all feedback would be directed to the Dev.
I’ve never liked the fact that Canonical and whoever can make Snaps and Flatpaks of other people’s software. There is zero security guarantee, zero guarantee they’ll update it and zero guarantee it will work.
Just because Snap and Flatpak exist doesn’t mean just anyone should be able to just make them.
If Valve only chooses to make a deb then so be it! It’s their product!