Look no further than Deck. A lot of Deck-ready games are just a lame potato mode presets that barely even work on Deck (Rebirth is a good example). My best Deck AAA experience, funny enough, was with Ghost of Tsushima because it was created around PS4 limitations and was wrapped into the good Nixxes port. And Stellar Blade, to a degree where portable display can hide FSR imperfections and low resolution can help with FPS. Almost every other new game is a race to the potato bottom.
Machine, that I'm sure will sell orders of magnitude less than Deck, will change absolutley nothing in that regard. You will get settings presets, some of them will be even decent, but that's all. Nobody will waste time, money and pipeline for a niche enthusiast mini-PC. Baseline will always float around fat PS5 specs and as for PC games, at one pont RT will become mandatory at least for big games, and meager Machine GPU will bite the thing in the ass faster than you can imagine.