That sounds like an assumption that's not actually been tested recently. Downloading a 2MB bundle or 100 separate files is an equally poor experience, but the separate files at least let you download only the parts that changed over time, instead of having to download a completely new 2MB bundle every time someone changes a single letter in one of 100+ files and a new bundle with a new integrity digest gets rolled out.

I'd rather have an equally slow experience on first load, and then much better performance forever, compared to having something that constantly invalidates the entire cache.