I feel like #2 is caused more because people try to be #1. Instead of letting good programmers develop well-established libraries that everyone uses - you end up with NIHS and a bunch of mediocre developers creating mediocre libraries that only they use. I became a better Javascript developer when I began using well maintained libraries to solve problems instead of wasting time reinventing the wheel every time I had a problem that needed to be solved.

Time is hard. I don't like to deal with localizing time, formatting time, or converting time. Instead I use a library [0] to solve that problem for me. Because while I may need to localize time - localizing time is not the problem I am trying to solve. It's just a roadblock in the process of solving my actual problem.

[0] https://momentjs.com/