They are fixed in place to a vehicle with a battery, still you don't have them powered.
Not that car ones (powered, heating, massaging, etc.) are not nice and comfortable, only that they remain a form of luxury.
I do drive cars, though, and sometimes other people's cars. I'd much rather be able to adjust while driving so that I can have better control over the car than have to fumble with levers, which might propel me back far enough that I cannot brake. Heck, I might have been having to adjust because I didn't realize how far i needed to press the brake in the first place.
https://news.ycombinator.com/item?id=29603532
Direct link:
https://www.thesamba.com/vw/archives/manuals/71bus/page1.jpg
Modern business and first class seats are indeed powered.