Fashion

Fashions come into style and go out of style and when they’ve gone you often look at pictures of yourself and think “why on earth did I wear that”.
Its no different in software development, with various tech gaining favour and becoming “fashionable” with everybody wanting to be using that tech only to find that it drops out of fashion later.  It used to take years for things to become unfashionable but with the rate of change increasing this may drop to a few months or even weeks.

Balance - Tech

So I know what you’re thinking “what is he on about? how does balance apply to the technology I use?”, well bear with me and I’ll explain.
A lot of developers will learn to code on one particular platform be it .Net, Java, Ruby, etc and frequently they’ll only look at one small part of that library and unless they are made to either look at different parts of the platform or use a different technology they will generally stay with what they first learned.