What would Miyamoto Musashi say? My point wasn't to focus on all of them but to focus on none. Find out how to acquire the best tools for the next job that needs to be done and make the best use of whatever you have at hand.
The source you have cited has given advice so subjective and sparsely considered that it's useless. And if I wanted to read game advice in poor English, I would google translate this: http://xn--hckqz0e9cygq471ahu9b.xn--....com/index.php