umm why exactly ? The game pretty clearly always intended raids to challenge high level players. Hundreds of thousands of players are lvl20 now.. So thats the new high lvl. Cap was 14 when reaver came out, so there just fixing that flaw now that the cap is up.
Seems to me that 99% of reaver on elite difficulty get run with at least a few level20s in the group. Why should it be the boring 1 player solo the raid while 11 go afk snoozefest is currently is on elite?
The lower lvl reaver lfms i see are almost always for normal/hard.
I doubt he has max/emp on normal, so if you wanan run it easily at lvl14.. There you go, I'd be willing to bet many lvl14s will continue to solo this raid on at least normal like they have been for years. It's not like theres any special loot on hard/elite here. Just like 2% higher droprate no one really notices.
The fact elite has been the defacto default difficulty for high lvls here for years has always been a major issue, not an intended design. The intention is always for most players to run raids on normal, and elite be limited to those looking for an elite challenge.