The dedication in "Scala for the Impatient" says it all :-)
I would like to thank my wife for making this book possible and my children for making it necessary.
Seriously, what could be better than to keep learning and to tell others about all the things that you find out?
Of course, it is impossible to follow everything--computing has become so incredibly vast. At some point, you have to filter and see what you like. I enjoy working with programming languages, but I am somehow not so attracted to machine learning. I've dabbled with it, and I appreciate its power, but it seems messy and ad-hoc. And I've made the decision that Bitcoin just isn't my thing at all. So, I spend a good amount of time keeping up with what I really like, and enough time with broad trends to understand the basics.
It's a big job, but then again, wouldn't the alternative be much worse? Imagine your specialty is divorce law or some such thing, where nothing new happens for years on end. I would find that really dreadful.