Its pretty bold of you to assume that you know more about this problem than every browser developer.
Websites don't just "use Vue". They use some particular version of Vue along with particular versions of other libraries. My understanding is that once you put all of that together, this can create some significant privacy leaks.
Millions of websites use vue (as an example) from the same CDN. There's no way to know which site it was cached from.
What a terrible thing they've done, making the internet slower for everyone on earth for no good reason.