I don't see why the official MuseScore website has not been improving a bit much as I have seen from the long time I have accessed this site for my scores. Recently, yes I don't like it, MuseScore added this piano roll function for beta testers. Though, when I use it on a score, let's say my Hopes and Dreams score for example, the score involves a lot of instruments including guitar and drums, but what I noticed is the piano roll goes way too much out of sync, and the lag is horrible. Even if I pause the piano roll, it STILL resumes with no actual sync. For a huge MuseScore community like this asking for improvements to the official site, it does not seem like there is any sort of change or response to be it either criticism or anything being said for improvement.