Sadly, mechanical window-winders and such things seem to be more expensive
to make and fit than the little electric gizmos, these days.  I agree that
it seems bizarre that 'better' technology is in fact less functional than
the older stuff.  

Perhaps car makers will eventually realise that car users sometimes want to
sit in the car with the engine off but still use other parts of the machine
- such as door-locks, windows, and radio - and can be trusted to manage not
to flatten the battery while doing so.  (I spent 20 minutes stationary on
the motorway a few days ago, waiting for the police and 'motorway
maintenance' to clear some debris and let the traffic get moving again).
However, a flat battery on a modern computer-controlled car is not as
trivial as it is on a car that has no computers, and modern engines aren't
as easy to push-start as the older ones even if they can start without the
electronics working.  So it is understandable that car makers try to
prevent batteries from being drained.

Fitting an 'accessories only' battery alongside the main 'starter and
essential electronics' battery, may be one way to overcome the present
unsatisfactory arrangement.  That would be well beyond my DIY abilities,
but future care designs might incorporate something of the sort.

I've learned the hard way that my ZX will flatten its own battery over a
couple of weeks or so, just to keep the 'security system' running - and
the resulting flat battery is completely dead, it won't take a charge at
all any more.  That is expensive, quite apart from the inconvenience of
having to move car batteries to and from the nearest car-related shop
without benefit of a working car.  The only way to stop that from
happening is to disconnect the battery (or take the car for a drive, of
course).  (I have tried a solar-cell trickle-charger, but it can't be
relied on - perhaps I need a bigger solar panel).  So the battery-saving
arrangement in more recent models is a sort of progress.