I just don't see any difficulty increase in the MSQ content. The three MSQ trials aren't harder than MSQ trials from the last two expansions. A couple of the dungeon bosses can get spicy when people have bad gear and don't know what to do, but that's also true of ShB and EW dungeons; Alexandria doesn't ask any more of players than Dead Ends did. All the solo duties in the MSQ were super easy, much easier than previous ones (the last one in Solution 9 is so scripted you don't even have to attack). I don't want to be mean but I can't imagine anyone who beat Zenos at the end of EW would have trouble with Bakool Ja Ja.

The one and only place I think the difficulty has gone up a bit are the Expert dungeons, which I think is totally fair given that 1) they're optional and 2) the name "Expert" had become a joke for two expansion. But even there, you do them a few times, you see the mechanics and get better gear, and they're fine.