No, you don't. SteamOS on Deck is only so stable because everyone has the exact same hardware, a version that people can just install on anything they want would have the exact same post-install risks as any other distro.
And even then there have been problems with SteamOS on Deck big enough that it made some have to re-image the OS entirely. There was one version that would stop booting once it hit a certain number of files on system, and all you could do was just to occasionally re-install SteamOS until it was fixed.
The OS being bug-free on valves hardware absolutely does not mean it will be on whatever you're chucking beneath your TV.
But this defense doesn't even apply to the claim you made, or why I took issue. What you said, is that SteamOS is "more powerful". It's not, it's objectively less capable than most linux distros. What you meant, is that's is more convenient, and less likely to require occasional troubleshooting.