this is only an issue because most clients don’t have a way to customize “replying to” although many have been motivated to implement this feature due to this recent mega list (sans a disclaimer to respect the mentions of the devs and not reply to the list). Disclaimer won’t be necessary when I can uncheck the people I don’t want to tag. This works two ways… so if you were replying to 5 people including me and I felt like the conversation had drifted away from the need to tag the 4 other people, I would respond only to you, and your only choose is to start a new thread manually tagging these people or to only reply to me.
You shouldn’t be receiving reactions to posts that you are simply tagged in.