[BeetleB]

Of these, the only thing I would like is automatic volume control, and HW only versions have existed for a long time.

Auto-brightness - I put in a lot of effort in setting the brightness/contrast, and would really not want some SW messing it up.

Voice control - couldn't care less (and yes, I do own voice assistants and use them).

[pandaman]

Something claiming to be X doesn't mean it's X at all least good at being X. This option on tube TVs that I had never worked for commercials, works so well that I don't notice it on a "smart" TV.

If you don't want auto-brigntness you don't have to enable it. I have a hunch that a TV sets it better (just for the reason that you are unlikely to adjust every time you turn lights on and off) but tastes do differ indeed.