You understand you can play Vintage Story on the phone? Id understand if you dont like playing games on the phone, but thats not really an excuse to say it shouldnt be on the phone. Minecraft is on the phone? PUPG is on the phone? the new Resident Evil 4 remake is even on the phone? You can get attachments if you dont like touch screen controls. Furthermore, my phone can fit in my pocket, my Steam Deck cant. And its not that much of a downgrade, be forreal, there's even phones built for gaming nowadays. So, realistically, you can play Vintage Story on your phone, it'll run fine on your phone, and it wouldnt be hard to port proper controls for phones.