Perhaps but thankfully not all webapps are like Facebook.

I would bet that js bundling and splitting might prevent that from being true?

There's a bunch of ways FB mitigates this.

If you have code splitting many chunks will remain the same.

As mentioned in the blogpost, they use code splitting and bundle hashing to actually maximize usage of browser cache.

Thanks siblings, for letting me know about FB’s use of code splitting and how it helps caching.