[wolco2]

If you put 100% of the load on the local server you increase your chance of failure. Moving the bulk of the load to a cdn can reduce the load.

You are only as good as your local server. Having a cdn means you need a better local server.

[ocdtrekkie]

I would argue if you're shoving so much additional JavaScript on top of your website that you need a better server to host it, you are serving way too many scripts.