Overall, I would say I'm delighted with what's changed up to now. However, there are still a few things bottle necking the PaytoWin aspect that's still left .
Shield/Safety/Clean Slate scrolls. We need more choices to save and/or regain slots when searching our gear. I am am very thankful for both we receive per month in the reward store, but realistically it's not enough when we have 100s of slots . Right now, Maplestory 2 Items bots seem to conduct a monopoly on clean slates in game and offer them for 30m maplestory2 mesos a piece. I would really like to see the limit in the reward shop upped to 5 or so a month, or possess clean slates drop much more often (possibly from zak, hilla, etc) to put them down to 5-10m a piece.
Untradable gear - mainly Android hubs, but in addition sweetwater gear, etc.. As someone who makes most of my cash from kisses and sweetwater, I'd rather be broke and find something else to market as a way to trade these around my maplestory2 account. Even having the capability to sharing label these items will be better than nothing.
I understand GMS is limited to exactly what it could do, but Spell Traces have to be updated to reflect what normal scrolls can do. I do not mind weapons being stuck at 9, so that they can make money off Primes with Marvel, but Android hearts should also be in a position to have 9 attack! This wouldn't hurt the Prime market, as min/maxers would still want them. As somebody who is probably considered middle class/mid game... These are the largest glaring flaws to me.