IMHO, there are two kinds of modifications: Reversible and Irreversible
I have long abided by a self imposed rule not to make Irreversible mods on any stock Fender instrument. My parts basses are a different story.
For example, every Fender 4 string I own has a HipShot Detuner on it. I gig them, and find the couple of lower notes the HipShot provides to be useful. I keep the original gear in the case; and it can be reversibly replaced at any time.
I also replace the pickups and preamps on the active Fenders. Again, I am careful with cutting wires, and store the original preamp in the case. A refit by someone down the road would have non-original solder joints. I don’t consider that a problem, though I suppose collectors might have a different view. For me, solder joints are a Collector problem. I’m a player.
My instruments all go out on gigs. Every one of them. I take care of them; they take care of me. Collectors can figure it out.
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