The main prob generated with the rework of classes is: Tanks an Healers especially DC´s give nothing to a group.
It´s useless to upgrade a tank or a DC.
run a Castle Never with a 10k tank run a castle never with a 26k tank - you will NOT feel a difference.
run a Castle Never with a 10k healer run a castle Never with a 26k healer - you will NOT feel a difference.
run a Castle Never with a 10k cw run a castle Never with a 26 k cw - you feel the difference the whole group feels the difference.
This means - Upgrades are ONLY usefull for DPS classes - it helps groups it upgrades the performance of groups - it makes the groups faster.
To upgrade a tank or a healer adds NOTHING to a group - This means in 99% of content it´s completly wasted to upgrade a tank or a healer.
As soon as people realise this - they change classes or they leave the game.
With my 26k healer I played since starting of Neverwinter I can now end up in groups not being able to finish Malabog. MY Toon doesn´t make a difference for the run. So it´s completly wasted resources to run a 26k helaer or to upgrade it even more. The same happens with tanks - I know many hi IL player tanks who also stopped playing Neverwinter because there is no more progress - you don´t feel a Difference if a 10k tabk is in Party or a 26k Tank. Because most of the high IL DC players and Tanks left with mod 16 or short after queues are not popping anymore.
In LOMM you can even run without a tank because one more DPS brings much more to the table than a 27k Pally Tank!
What needs to be done is: Make DC´s and Tanks usefull for the group again. They need to Buff the group so you can feel a difference if you run with a 26k Pally or 26k DC or you run with only 10k ones.
Mod 16 made DC´s an Tanks upgrades useless - the only time why you could upgrade your toon is to run TOMM - but even there you give nothing you don´t make a difference like DPS does. Big DPS you finish - big Support classes you stil fail! Thats wrong on too many lvls and this is not helathy for the overall community.
Upgrade Tanks and DC´s needs to be on Prio one and needs to be in the game asap - not sure if some players come back - but the ones still playing maybe stick around.