I second that.The field of electronics is so vast that nobody can know it all. Even well educated engineers will step into a company with a decade or two of R&D under its belt and find themselves learning how far a particular expertise has been developed. You learn as you go. Everybody does.
When I first entered college I had this belief that once you graduate you ought to know everything. And I mean literally everything(electronics) under the sun. But then it began to hurt. There were just too many areas and a lot of ground to cover. The Math, the Signals, Devices... I thought it'd take me a looong time to learn all that. I had mistakenly assumed that my professors knew just about anything and I learnt it the fun way
I see its okay to know some, forget some. Electronics, much like any other subject is huge. No one can become a know-it-all. So, I guess I'm not alone