Because like you said, it’s a nice to have feature. I like my wife’s auto closing hatch for when I have a handful of boxes for that final grocery run and just walk away and it closes. It’s literally just really nice convenience feature and if it fails, you go back to closing it manually.
I get it’s nice to have, and if it somehow cost nothing I wouldn’t mind having it in a car, if it’s pretty much guaranteed that when it fails it doesn’t prevent me from open/close manually. But I’d much rather not pay for neither the R&D, engineering, parts and manufacturing of it, only to end up with a more complex door mechanism that is more expensive to repair and more likely to break. When all it does is give me the slightest of conveniences. Best example of this is the motorized charging port lid on the Rivian. Like, whyyyy? Cheaper and longer lasting vehicles, please.
