The one time I've run into this 'bug' in the past was on a site that used lots of javascript plugins, more and more of which are coming with their own CSS files

The one time I've run into this 'bug' in the past was on a site that used lots of javascript plugins, more and more of which are coming with their own CSS files nowadays. Of course you can concat them together, but that adds a maintenance burden in the future whose size can vary wildly. At the very least, there is a documentation bug here. The reason for this seemingly arbitrary limit should be documented by MS.