The issue with starting your own typestyle library is trying to clear out all the typestyles you don't want included in your new typestyle library because you end up having to delete each typestyle you don't want individually...it's sort of a tedious process.
At Style4Type, we build our own typestyle libraries of course. However, we are too lazy to delete typestyles one-by-one. It really cuts into the time we've allotted for watching vintage Scooby Doo cartoons and practicing clog-dancing. Our secret weapon is this (almost) empty typestyle library that we can load through the 'replace typestyle library' command to start with a clean (or...at least spacious and tidy) slate.
If you, or someone you know is trying to create their own Premiere Pro typestyle library...you may find lots of value in having a nearly complete lack of content. Download your empty typestyle library here. (And fill the space with your typestyles...)