This.
Even collectors of 200+ year old Stradivarius instruments understand that proper maintenance doesn't detract from value. Many of those things have fingerboards and necks replaced, all kinds of repair work, and the people that appreciate them don't think any less of the instruments unless the work was poorly done. It certainly hasn't hurt their value.
It's funny to me how bent we can get over a refret on a working bass all of 40 years old. Properly done it will extend the useable life of the instrument and protect the "irreplaceable" brazilian rosewood fingerboard. Of course, some AVH collector type will disagree vehemently and it's certainly their right to do so. And its my right to be amused.
OP, its your bass, do what you will to make it enjoyable and work for you.