Octave switching doesn't really address the problem...

But only if you are playing TWO parts at a time. Sure, you lay down the bass part on its own, heck, a 37 note keyboard would do! The problem starts when you want to play a bass line (or, TBH, any left hand sound)... to leave yourself a good useful range for the upper sound, AND a useful range for the bass sound (I usually like at LEAST 2 1/2 octaves of bass), you can't really be happy with an arbitrary loss of ANY notes at the top end.

Again, saying that, if you really want a larger keyboard size (or more accurately, you DON'T want a smaller keyboard size) an 88 is an acceptable solution doesn't address touch, weight and size.

I think you are coming from a STRICTLY studio perspective, and again TBH, if your studio is SO tight that a 76 rather than a 73 is going to make problems, you need a larger room! Or a better layout!

But the minute you start thinking of playing live, ANY loss of notes is a detriment. But saying, if 73 isn't enough, 88 wood is an acceptable alternative is not really looking at the issue.