Oh, I could learn SVN. Or Mercurial. Or Node.js, Groovy, MFC, solaris, AngularJS, Adobe Illustrator, Guitar, Unicode, Python, Web Services, Satellite Radio, JNI, C#, Haskell metaprogramming, Android, Client-server models, Nuclear Physics, ASP.net, Flex/Yacc, Cocoa, COM, Blender, DOM, TCP/IP, XML, Finance, Azure, Cassandra, VIM, Emacs, Arch Linux, Regex, Category Theory, Statistics, Maya, Color models, IEEE-754, Compiler optimization, OS design, Database management, LINQ, Piano, Struts, ML, Prolog, Scheme, Homotopy Type Theory, NLTK, GTK+, X windows, WPF, ...
Why would anyone care that I know git and haven't explored other options? Do you happen to need someone who can write source control software?
I mean, I had to use ClearCase for years and hated it. But I know how it works and why I hated it.
The most popular solution could be the best one. I just want to hire people who think for themselves because I don't have time to do their thinking for them. But first I need to make sure they are really adept at problem solving and can adapt.