This article resonated a lot with me because Matthias is advocating for an idea that I also support 100%: the idea that you should reinvent the wheel for the sake of improving your own understanding of things.
In this article, Matthias goes on to provide a series of strong arguments in favour of reinventing the wheel from time to time, but for me two key ones really are the fact that building things from scratch is:
I preach these two ideas a lot but I also practice them.
For example, roughly two weeks ago I was at PyCon US 2025 giving a tutorial whose main premise was that you'd learn a lot about iteration if you tried to reimplement the module itertools.