If a function can be controlled from more than one place (such as power windows or locks that can also be controlled from the driver’s seat or key fob, or anything controllable by software via central control panel) then you can’t really have a manual, state-full control for any of it since it can go out of sync with the state of the function.
The exception would be to put a tiny motor on each control to keep it synced up, but the cost to reliability (not to mention just money) would be unacceptably high.
As substitute for physical state inputs I could accept separate inputs for different states (this excludes off/on toggle buttons, but could be satisfied e.g. by separate off and on buttons) and a state indicator in a visible location, preferably close to the input.
Power windows are close to fulfilling this (up/down separated, and it might be argued that the state is sufficiently obvious, though questionable for the rear windows). A central lock controlled through a common lock/unlock button does not satisfy this.
Yeah and I guess some things, like door locks, are actual mechanical things that involve having a motor there anyway so it shouldn't be too hard to just expose some part of that mechanism in a way that indicates the state. This is done now with that little nubbin that sticks up, but I think can be made more obvious.
I think the big sticking point is usually climate control and radio since that's what people fiddle with most while driving. Maybe little things like the ride mode selector (but I'm not sure how many people actually fiddle with those sorts of things in practice). But nowadays the "radio" is rarely just radio or disc/cassette player. It's music, audiobooks, or podcasts off a phone. I don't really know how you do that with integrated controls that aren't screen based, like most luxury cars already have the little control wheel and also controls on the steering wheel. So what more would you need? Maybe some haptics on the control wheel to give you more feedback?
The exception would be to put a tiny motor on each control to keep it synced up, but the cost to reliability (not to mention just money) would be unacceptably high.