With secure boot, combined with a signed kernel and initramfs, and basic TPM keys, every official Steam Deck can have full hardware attestation the same way mobile phones and some laptops do. This, combined with existing anti cheat solutions, can work to detect cheating.

This. We already have a secure environment for gaming. At this point, it’s essentially better than what Windows is offering. The only reason game devs carefully ignore this issue is because of market share.