https://hothardware.com/news/steam-deck-tpm-support-install-windows-11
I mean I generally agree with you, but the SteamDeck runs on an AMD processor with a fTPM that Valve slowly added support for.
It seems unlikely Valve will ever make Windows the primary OS for their devices. And they’d lose a lot of user support if they ever required the TPM for their own software, so hopefully they wouldn’t risk it.
I doubt they would risk it as well, but the point is that it exists on the SteamDeck and can be utilized.
Why does everybody seem to think that userspace attestation is the only use for the TPM? The primary use is for data to be encrypted at rest but decrypted at boot as long as certain flags aren’t tripped. TPM is great for the security of your data if you know how to set it up.
Valve is never going to require TPM attestation to use Steam, that’s just silly. Anti-cheat companies might, but my suggestion there is to just not play games that bundle malware.
Whatever is touted as the primary use doesn’t matter as much as what anti-user features it enables.