Honestly though, that kind of detour is half the fun for me. I get why it's frustrating if you had a set plan, but finding that random shack is a way better story than just following a blue dot. My best hiking memories come from my old paper map leading me somewhere totally unexpected.
Last summer my buddy and I got totally lost on a paper map trail near Lake Tahoe. Ended up at this old fire watch tower that wasn't even on any app. The view was insane, and we ate lunch up there for an hour. That's the stuff you remember forever, not just hitting some GPS point. Totally get what you and @wesley139 mean about those surprise finds.