Back in the day we simply relieved the pick guard if required with a rats tail file and used a long shafted screw driver. A period correct mod. Nobody would tolerate having to unscrew the neck.
Also if you are setting the relief with a feeler gauge the neck would be on and off more times than a tarts knickers.
Form follows function!
I suppose if you are OCD it matters more (not meant as an insult)-I just do a quick test to see if the relief is right for me. I am near OCD enough that I almost always perform this "feel" relief test before tuning and practicing-my particular vintage style neck is very stable and have not needed additional truss rod adjustments *for my "non-OCD" needs*. The intonation is right, and the feel amazing, cold, dry, or normal. The other bass with the "regular" allen wrench, headstock adjustment (I suppose those are also too old school for the modern bassist as well) has needed more adjustments than the vintage neck-perhaps luck, but also the vintage neck bass is more expensive. So I have the urge to check relief, but do not feel I have to reach for a feeler gauge all the time (which would not be wrong for someone else to prefer and do.)
My apologies if I appear contrarian. Just a short thought to express that at least in my case, I do not sweat the vintage neck truss rod adjustment as much as perhaps the majority do. Each to their own.
