That doesn't apply to side airbags which I think are a great idea and often lacking in cars from the 00's let alone older vehicles. I have backup sensors but some of the rental cars I've had have actual backup camera which I would love to have. And adaptive cruise control I've experienced is another feature that I'd like.
I know...that's why I added the note "that was sarcasm"
As for backup sensors and cameras, in my opinion they're actually a side effect of vehicle design, moreso than an advantage. I've driven tons of older cars, where you have great visibility all around, can see all four corners of the car, see most of what's behind you, etc. But nowadays, with the prevalence of SUVs and crossovers, and trucks, and even things like thick roof pillars, high decklids, and back seat headrest in cars, visibility, especially to the rear, has gotten horrible.
I think backup cameras are actually required by law on new vehicles these days. I'm not sure what year that started, but it seems like everything, down to the cheapest throwaway cars, tend to have them. So that's one feature that you'll probably end up getting eventually, whether you want it or not?
What is adaptive cruise control like? I've never had it, as far as I know, at least. It's been awhile since I've used cruise control. I don't go on long highway trips that often, and the few times I do, I tend to forget the cruise control is there!