I still don't see why matchmaking hasn't been implemented into every activity. Yes, raids could be difficult with matchmaking, but everything else could be doable with it. It would benefit the game greatly in my opinion without negatively affecting a single thing. I honestly can't see any logical reason for not including matchmaking on nightfalls/high level POE arenas/raids. But that's just my opinion, so oh well.
Edit: After reading some of the replies, I realized something I should have put in the original post. The matchmaking should be optional, and you should be able to do the activities solo if you wish. Having options is always fun.
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Matchmaking for your mom