It might be. But then tensorflow/pytorch are out there, too, have documentation and have CPU-only modes.

I say this as someone who coded a number of numeric algorithms (BFGS, Nelder-Mead, etc) from scratch just to understand them, while knowing all along I wasn't competing with real OR libs. On a few occasions, my own implementations were handy for proof-of-concept work when adding 3rd party libs was a hassle.