I think in MuseScore, there could be two modes: Manual or Automatic.
Whenever you apply something in automatic (markings and symbols, etc), it would have the correct, precise, neat, tidy and even positioning with nothing (exception to things like gliss perhaps?) overlapping the system (the hairpin, in particular), or looking out of place. The system and staves would accommodate whatever you do (eliminating the general need for spacers. Maybe exception cases - available in manual?). Other than select objects perhaps (accessible by double click?), nothing should be movable (note stems/flags, bar lines, dynamic markings, etc).
This would all be useful if you are limited with time. For example, you no longer require the extra space that accommodated imposing objects (since changed/removed). You also wouldn't have to waste time moving other things that are blocked (though I can't think of anything directly, other than things correctable by the spacer).
Overall, the score would look more professional standard release quality (the kind you see in commercial manuscript).
For those who prefer their scores to appear more personalised, there is the manual mode. If you choose to restore a singular object to its original 'factory' position, you could right-click it and reset position.
I'm hoping to start a discussion to gather opinions (if there are no objections) and have it presented properly to the developers.