> Even in the usecase of GUI programming, where OO is supposed to shine the brightest, OO is a failure because interactive programs are extremely concurrent. Even back then when everything was executed in serial GUI frameworks were designed concurrently in crummy languages never designed to support concurrent programming such as C. Or worse, C++.

I must say that I have trouble reconciling this with the fact that every single GUI program running on my computer right now is written mostly in C++ with a bit in C for my WM and a bit of Rust for Firefox.