Hello, I bought the TV some time ago, I can't report much about gaming, except that nothing shakes with the switch, or no more than before. But if you want to connect a PS5, for example, there is also an HDMI 2 port, as far as I know.
I also bought a suround system from sony so it's like being in the cinema. To your question, I think the sound is totally adequate and good for the size of the TV. I never use the full power and find the sound completely ok. Just under 1000chf more only for 40watt more sound i don't know then better buy a sound system for 100-200chf.
According to my research, the subtitle should be deactivated by default. If this is not the case, you can find a video here on how to activate or deactivate it: https://www.youtube.com/watch?v=qoAls7s39sQ
Also kompatibel ist es bestimmt, jedoch habe ich leider kein Apple Gerät:
https://devicebase.net/en/samsung-qled-4k-q60t-2020/compatible-with/apple-airplay-2