I think you are letting over speculation of what might happen force you into a perspective of thinking you can dictate how others play the game. Maybe here’s some points for consideration…
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Group finder addons came into existence in Vanilla WoW. People had and used them. The scenario you describe did not happen. I found groups in both fashions, though personally I had a strong preference towards the addon because it made it much easier to find what I was looking for.
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Not everybody will use the addon. Back in Classic there were many people who chose not to use addons entirely! It was some times a struggle in raids because people would miss cues, but we made it work.
You’re basically worried that everybody will do a thing, and so you too will have to do a thing even though you don’t want to do a thing. I don’t think it’s going to be as bad as you think, but maybe wait until it is a problem before you get so invested in it.