Do tire / tube / valve combinations that don't leak air exist?
You assume the whole leak is the valve.  Rubber is not air tight.  Most of the leak is through the rubber.

Clearly can create a near airtight valve.  And with enough rubber a near air tight tube.  But it would be heavy.  Just pump your tires once a week.  I see the link said pump daily.  OK, at least once a week.  On my road bike I pump before every ride.