We have a large project with a large number of css files. I use MS bundling which combines everything into a single file in production. Some might argue we have too many css files, but having a file for each relevant section helps to compartmentalize and organize everything.
When we test with IE8, we run into the 31 file css file limitation. We can get around this by running in Release mode (which bundles all the css), but then the JS is bundled as well, and we can't debug.
Is there a way to make our CSS bundle, but not the JS?