The fact that it was at the end of the expansion really has very little bearing on the fact that the gear was basically on par with mythic raid gear for that patch.
People keep saying it would ruin dungeons and raids but there’s never been any evidence to back that up.
People used to insist that if dungeons ever awarded gear comparable to raids it would be the end of raiding because nobody would ever raid again. Here we are 3 expansions into the M+ system and raids haven’t died.
Hell I remember at the end of Vanilla when people complained that raiding was pointless because you could get easy epics from PvP and again, raiding didn’t die out.
That’s my point in all this. If Torghast mimiced Horrific Visions and let players get up to ilvl 226 gear provided they could clear the upper levels and let’s say they tied that into the vault system then we would not see the death of raids, dungeons, and PvP.