[S_A_P]

The funny thing to me is that you implicitly mention something else in this point. The languages/databases you specify are all popular in web/mobile/end user based applications, and almost exclusively never used in enterprise where C#/java/Sql/Oracle still make the vast majority of tech stacks.

You could add another layer to what you are saying as do you want to build apps? platforms? or enterprise line of business software? if so you need to know entirely different stacks. Then you need to know what is important to being "good" at the chosen stack.

This is just a long winded way of agreeing with you, there are vast amounts of knowledge required to "make it". Most importantly you cant ever feel like you know enough and stop trying to learn. I took about 12 months off from stretching myself and now I feel 3 years behind...