Part of it is Not Invented Here Syndrome. That's not always bad. No framework does everything well, and the ones that come close often have fundamental architec

Part of it is Not Invented Here Syndrome. That's not always bad. No framework does everything well, and the ones that come close often have fundamental architectural limitations. Even the best of them become bloated or outmoded over time. Once things start being designed by committee, they tend to go downhill quickly.