I can answer the OP in a single timeworn adage, I hope nobody in the thread beat me too it.

A jack of all trades but a master of none

If you want to be at the pinnacle of a class, expect to sacrifice elsewhere. If you're happy being average at them all, then you can do that too!

Being able to level all the classes on a single character isnt at deficit to this, it means you can change where you want to focus your proficiency at any time.