Stay up to date, but how
With the number of libraries you use and the different solutions you build and deploy, it’s virtually impossible to keep track of what version of which library is used in which solution, and which library should be updated. The good news is that you don’t need to do it manually.
_SPCAF suggesting upgrade of AngularJS_
Even if you’re not changing your code, it would be valuable for you to run SPCAF analysis periodically to verify if there are any updates that you should be aware of.