Of course you can just not do that, and then problem solved.
Historically there is some performance benefit of using a separate CDN, as browsers would share the cache. However modern browsers do not do that. I suppose in theory the CDN might be geo-distributed to be very close to your user, however it seems like the latency of opening a second connection (esp. In http/2
world) would likely outweigh that unless your web server is really bad.
Cloudfront and cloudflare can both present edge cached resources as from the origin domain can’t they? Akamai did not as I recall but that may have changed after I stopped needing to care about them.
Historically there is some performance benefit of using a separate CDN, as browsers would share the cache. However modern browsers do not do that. I suppose in theory the CDN might be geo-distributed to be very close to your user, however it seems like the latency of opening a second connection (esp. In http/2 world) would likely outweigh that unless your web server is really bad.