Ibot39 You are so right... Would you do that if you had a 100K+ LP that had developed a G-string problem whilst in your care?
I would do and I already do it on ANY guitar that needs a quick fix
I did recut the nut on ALL of my Gibson guitars (5) slightly. I did make a complete new bone nut for my Gibson Flying V - wasn't too difficult either and I am really not a genius or something.
I changed almost all bridges too, because at some point Gibson was not able to get the slots in the bridge saddles right. They just used a string and a hammer to make a groove. And if they slipped, they made a second groove on the saddle or leave it that way.
On my Musicman Stingray I did adjust the compensated nut with fine tools (but I have bought an original Musicman nut as a replacement, to have the original nut back on, when I want to sell it).
If a pot or some electronics are broken I change and repair it - doesn't matter how much the guitar did cost. I learned to do a good fretjob with an old squier neck and with the right tools even refretting is not very hard. So now I will never ever fear wearing down frets.
If someone doesn't have time or fun doing such things - no problem at all!! Therfore experienced luthiers exist.
But everytime I went to the local music stores, there are people bringing their guitars in for nothing! For example tuning them (no joke!! people bring their guitar every few weeks, because the guitar went out of tune!!). Or the action is too high - holy shit, if you play guitar you should be able to adjust the action yourself, get the intonation right, change your strings, adjust the height of the pickups (and pu screws for balance when needed) ...
Maybe this is all a problem of western civilization. People no longer dare to do the simplest things themselves. People in poorer countries know what they can do or they learn to do it. They are not so helpless.
Taking a piece of sandpaper and slightly rework and smoothen a nut slot (done by a plek machine, but a bit to narrow) is the easiest thing in the world. Even on a 100K+ guitar. And if you totally fail, you can refill the slot - or still go to the luthier. As said: It is just a nut. You can change it a thousand times without doing any harm to the guitar.
Of course it is possible that someone drops the sandpaper on the body and is rubbing the surface by mistake....NOT (if this someone is not drunk or something)