React was invented because anytime developers at Facebook touched code regarding unread messages/notifications, they would introduce a defect. You'd find the e

React was invented because anytime developers at Facebook touched code regarding unread messages/notifications, they would introduce a defect. You'd find the error and then fix it, but it was fundamentally a minefield. So, they had to invent a new way of building frontends, and then all those defects went away. Now, I do tend to believe, that there still is a lot of low-hanging fruit with regards to programmer discipline. Many juniors (and some seniors) just straight up don't pay attention to things, don't check things, don't think things through to their obvious conclusion. You can then try to add policy to try to force them to do these things, like, e.g. you must have 100% coverage on your code, maybe that'll force them to try running their code at least once before merging into master. But then of course that must be a blanket policy for everyone, and you know how the story goes.