Comment by anovikov

I think it's because of the tasks they did. For run of the mill custom development projects AI certainly speeds things up a great lot. But when i tried to use it for comparatively hard tasks, i found it easier to do things by myself. It was nothing too fancy, just bitwise image manipulation - a custom code for pixel format conversion combined with image resizing that had to work a lot faster than ffmpeg's, but in a narrow set of conditions - no miracles here, it's not at all smarter than ffmpeg's, just specialised. 100% hand-made code took less time to build and was just as fast to execute. Of course, it used intrinsics.