I prefer to call them strike indicators.
You were kind enough to share with me what fly was working for you on the ancient cataract. I tied one up with the red bead and have had great days with it. I dare not hotspot the pattern.Ah, you're a competitive fisher.
Someone else improving their fishing experience is never going to bother me, and the guy in the next boat using my favorite fly pattern is not going to make my fly less effective or result in an overpressured resource.
It's not the same as hotspotting - places can get overcrowded or overfished