I work on cars professionally. I know of no American market vehicle with a seat reminder that does not have an option to turn it off.

https://www.chevrolet.com/support/vehicle/security/rear-seat-reminder

https://www.ford.com/support/how-tos/more-vehicle-topics/seats-and-seatbelts/how-do-i-enable-or-disable-the-rear-occupant-alert-system/

Not at all they are safety features that are mildly annoying that the end user can disable if they’re certain the reward outweighs the risk.

All of those things you’re complaining about are usually able to be disabled. Hit me with your car make, model and year and I can probably send you the exact page in the owners manual that tells you how to disable them. The only one you can’t is the one required by federal.

Again not playing movies is so drivers don’t use it, the good example is Tesla having to disable games because people were using them while driving. People are dumb, sometimes you have to work around abject stupidity.

What it seems you’re against is actually looking into disabling the things you are annoyed with. They’re usually like 5 button presses on the DIC.