I agree that it is impossible to keep up with everything. I am more viewing it from a prospective employability position and safeguarding my future interests. I may do very well writing apps in containers with traditional load balancers, but I very well better learn some Serverless and JAMStack type patterns as well, as a completely random example.

It's part of the filtering process to determine what subset you want to target, but learn something new as often as you can. The bonus I've learned over time is the more paradigms, tools, and technologies I learn and practice configuring and launching sample apps or solving simple challenges with, the more they all start to look and feel the same.

Also once you've done it for about 10 years you realize there's not a lot that's really new.