Name me one bike shop that has sewn something. Maybe it's an English thing but I've never seen it. Suffice to say I'll never sew, build wheels, wrap bar tape. They're just my rules.
Anyway it's the sort of skill one might need if one's bib shorts split down the arse whilst one is doing an unsupported solo ride through Mongolia or whatever
Yes:
"I'm going to eventually own every tool and every required lube, spray, paste, etc. until I'm basically running a bike shop catering for one, me."