That can be a horrible time sink as well though. Imagine if only changing one thing means, that you need a test cycle of 15 minutes or even if it is only 5 minutes. You will need 5 minutes per change then. If you know multiple things you still need to change ahead of time, you might also go ahead and fix them all, and then fix resulting or remaining issues after only running one test cycle.

I think it depends on the situation, what the best approach is. Is it a system, which is running in production and you are operating an "open heart"? Well, better only change one thing and check. Is is a newly developed thing, which you develop on your own dev machine? You can easily fix many things and many more will still remain for further iterations.