I run into this all the time. There is always something more to know and everythng is evolving so fast that I personally don't think you can be an expert in any

I run into this all the time. There is always something more to know and everythng is evolving so fast that I personally don't think you can be an expert in any technology anymore. If you can understand it well enough to produce a completely new product and be able to figure out what you don't know fast enough to not make it a hinderance, then I would call you at least very knowledgeable.