It's hard to judge nex changes since stuff like droprate scaling isnt known to us yet. I for one had fun massing it on day 1 with strangers and not worrying too much about other people having bad gear. The mechanics being a bit relaxed is nice since coordination in an 80 man boss lair is difficult.
Smaller scale nex kills being a bit harder mechanic wise but more rewarding would be good but please dont make casual masses impossible
From the conversations with the developers I've had, I don't think the intention is to stop casual masses ocurring. I'm pretty new to PvM myself and Nex is something I'd like to do as a segway into even more challenging PvM. I think that they just want to ensure that players learn mechanics properly rather than cheesing through with big groups.