That's very true. I think the most frustrating thing (that I regularly see) is people trying to do a minor fix in a wizard (let's say on the 5th step) and going

That's very true. I think the most frustrating thing (that I regularly see) is people trying to do a minor fix in a wizard (let's say on the 5th step) and going through every step again just to see if the bug was fixed. Things like HMR can help here. That's why things like mock-service-worker or having prefilled Redux stores (or whatever state management you use that allows something similar) are a real time saver. Of course fixing the bug based on test is always better, but often you have to fix something visual which is a little bit harder to do with tests.