They never asked for one becase they never imagined being able to afford one.
The amount of administration organizing a normal household takes I suspect most would be glad to leave to someon/something they trust and that can be held accountable.
Today that someone needs to be a person (imo). But who knows, a startup may be plotting accountable digital assistans as we speak.
You must be of size medium to small then because legroom is definitly an issue for me, especially for longer flights and I'm just 180cm. (just below average hight)
Or alternativly you can afford better seats than me.