This has been discussed before on Discord and in passing on the forums, but I think it's an involved enough issue to warrant its own thread. The introduction of talents - critical hits in particular - has had a negative effect on endgame bashing because the legacy endgame areas were designed without the sort of DPS players now achieve. With max crits each area can support one basher, leading to a total of seven concurrent players bashing if I'm being generous. In practice, though, only Ixsei, Usum Usutti and New Dikamazi are regularly cleared by anyone, as the others are widely considered not worth the effort due to increased risk and/or low mob counts.
One solution I've seen suggested is to have new areas be high risk because of wandering aggro mobs. We already have these (Jelle, Gnomon) and it's easy to see that this isn't a solution at all because, as I said, they aren't regularly cleared. Adding new areas that present the same challenge people are already avoiding would be a waste of time. Changes can't be made to existing 'worthwhile' areas without negatively impacting pre-75 players, though, because Ixsei and ND are where most people go for their last 10 levels.
In my opinion, I think the best way to move forward with new areas taking into account the higher DPS we achieve would be to lower the TTK. If mob HP and XP gain were scaled up to match the TTK and XP/M of pre-criticals bashing, the area would both be a viable alternative to the overhunted areas we currently have and probably be able to support more than one person at a time.
Also, none of this is intended to be me saying 'this is what you should work on' so much as 'these are things that should be taken into consideration if/when any work is done on new areas.'