I get your point, but I skipped the details there in order to not water down my story there.
In my city, I‘m just using car sharing anymore and they just have ID.3s. Now, half of them come with the feature on, the others off.
If you let the brake go at the traffic lights because the exact same model of car you took on the other way had auto hold activated, but this one doesn’t and the car suddenly starts moving towards the car in front out of the blue, believe me it feels quite critical.
Put it in neutral or use a handbrake. You are blinding those behind you. Especially annoying in the rain.
Auto-hold is helpful with automatic gearbox. I find it helpful in a car but driving almost any pre-2010 manual car requires mastering the clutch and hill start.
I’d not call auto-hold critical, neither would I call the “defogger” critical for that matter.
The only two critical things in a car would be in my book: working brakes and tires in good condition. Everything else - meh. If it has a minimum 3 wheels and a steering wheel, I’d drive it.