Anyway, the idea:
If you have ever struggled to find a public toilet in a strange place then this idea will appeal.

Convert every lift to a toilet, with a mesh floor for urine control, and a pedestal/seat for those who can't bring themselves to "kangaroo" in a corner, including the fairer sex. (Email me if you can't figure out the term "kangaroo")

Into the top of the lift, add a water tank that refills whenever the lift reaches the top of its travel.

All waste funnels down to a "honey tank" under the floor, that flushes whenever the lift is at the bottom of its travel.

Like those French automatic toilets that wash themselves after each use, the same sort of thing could be done with a lift, whenever it's on a long travel between floors, or on a regular schedule. Either way, it's possible to control the "nasty" aspects of smell and cleanliness, using the right systems.

Hydrophobic surfaces would make everything a lot more pleasant to use.

All buttons can be waterproofed, and you can use it while others are in the lift, if it's that urgent. Given that most buildings have their waste management plumbing in the basement makes this easier.

You know it makes sense.