Cable disc brakes. I kept putting it off but it was riding like shit and didn’t feel safe, brake levers nearly contacting the handlebar. I had it in my head that the adjustment was like a 30 minute job. Grabbed Allen wrenches, a couple third hands, screwdrivers. 5 minutes and two Allen bolts later, all done. Topped off the tires with air, quick test ride, meat’s back on the menu. No real point to this post, but maybe you’ve made a quick adjustment or repair that made you happy?
Yeah, I can feel how clean and lubed my chain and sprockets are based on how smooth pedaling feels.
But that’s not how most people work, if performance drops over time, if how something sounds or feels only changes gradually, they probably won’t notice and investigate closer until something almost completely stops working.
I make no assumptions when working on other people’s bikes, I check every possibility.