That’s because doing it over and over again isn’t content. Don’t you want to complete something and enjoy the fact you are done with it? I very much would love to complete a dungeon and be done with it so I can move on.
Again if you like the M+ system cool. Just don’t force people into that activity and call it content when it isn’t.
Let me ask you a question. How many hours a patch do you want to spend in Dungeons? I personally want to spend about 20 hours tops. I want to complete them and be able to move on. Keep in mind I typically play games about 40-50 hours a week.
The problem with modern WoW is it’s a hamster wheel instead of a journey.