Generally the point of playing is to have fun, not work hard to get x items. Surely it is now easier to get some low-tier cheap stuff (which is the main reason for such items to exist at all), but 5th dan+ items do already cost quite much for regular users. And Elite tier items are even more pricy, so if you need some sort of stimulus to play apart from becoming more skillful / meeting more friends ingame, acquiring full demon would still work like it did before. The difference is that now you're able to buy it from the Torishop with TC as well as with USD.

Regarding the desired/undesired items: each tier has items which were sold extremely well and each has those which were not sold that good. It doesn't mean that all desired items now require 20 QI, neither does that mean that they all have a custom belt requirement. Toxic was just an example of how one color was made accessible a bit easier. Static's price was about 2 million in the shop, so it was moved to the Elite tier to keep it available for pro players only.