Earlier quoted context omitted.
I'm much more productive since I realised I don't have to use "standard" tools. It saves me so much time. With that being said, I don't make everything myself, but just the thought that I'm not obliged to use the best-practice standard solution to the problem is liberating to me and it makes me so much more productive in actually doing stuff.
Besides, even if you use the standard tool today, five years from now this will be "the tool that was standard five years ago" unless you actively migrate every so often. There are a few domains where the standard tools remain the same for a long while (Google Analytics being one), but often the standard tooling shifts more frequently than that.
When I research about programming languages I'm always amazed how almost every feature existed in the 70s as well, just no one bothered to use it.