Is modernmix necessary with 8.1?

I purchased and installed modernmix back in April, and at that time it was obviously a necessity. Since installing 8.1 this Fall, I've tried a few times to find articles about the new features of 8.1 supposedly inspired by the user frustration that led us to look for help from things like modernmix. However, I haven't found yet any information that simply lists the problem and the 8.1 solution. I would rather not uninstall modernmix (and classic shell - which I used to restore the start button) to find out what is solved or still lacking in Windows since the 8.1 update. I don't see anyone running basic 8.1 writing that they are frustrated by the lack of windowed apps. Is that one of the things they solved in the update?

In a nutshell, what does modernmix do that 8.1 does not cover? Thanks for your help.