Most mythic raiding guilds are running M+ all the time. And everybody can join a mythic raiding guild as a social. This is by far the easiest entry to getting into a more enjoyable environment for M+.
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The interesting thing is that TBC dungeons are very easy, hence why they are relaxing. So in Shadowlands you could just run m0 dungeons and ignore the whole M+ system. That would be similar to running TBC dungeons..