This part isn't so true in reality anymore, due to revised browser caching systems[1]. Doesn't mean you shouldn't use jQuery, just that part of the benefits of a centralized CDN are no longer a factor and it's a lot more sensible to self-host.
1: https://www.stefanjudis.com/notes/say-goodbye-to-resource-ca...
A single retina hero banner is larger than most JavaScript libraries/frameworks.
Preact [0] came before Vue [1].
[0] https://github.com/preactjs/preact/commits/master?after=605b... [1] https://github.com/vuejs/vue/commits/dev?after=5255841aaff44...
https://github.com/fabiospampinato/cash/blob/master/docs/par...
In the last five years, the release schedule has slowed, so there was a convergence onto fewer versions in the wild, but at the same time, users were visiting fewer sites that used CDN versions (and fewer sites in general.)
Unfortunately not. There is no benefit to leaving your critical files on anyone else’s infrastructure: https://csswizardry.com/2019/05/self-host-your-static-assets...
Back then we decided it's just better to self host. Less things can go wrong.