I dunno man, I always had the mindset that raiding and doing dungeons is like riding a bike, you never forget, like "once a mythic raider, always a mythic raider", anyone good enough to get 1 cutting edge is good enough to get any cutting edge. Obviously you need to learn tactics, but if someone, for instance, links a cutting edge for a previous expansion + say they know tactics, I'd invite them to HC every day of the week, I value that more than someone with the current Ahead of the curve.
Same for M+. I did high keys in Legion, which one can argue were easier dungeons, but still, I understand the pressure of high keys and affixes etc, but since I have nothing done in SL, I still can't get invited to a single M+ dungeon. I find it riddicilous that I can't get invited to anything above maybe +5 right now when I did +25 in Legion.
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I WISH I could do some M+, I don't hate the concept, I just hate the way the leaders operate. Unless you are already in the raider.io club, you can't get in