Well, get ready for it. GitHub is moving towards React, Next, etc. I bet it will be another disaster like Reddit.
[1] fun fact, you can shorten this to “ol.reddit.com” which is nice because it only requires one hand to touch type “ol.” and get an autocompletion. I always thought reddit was a great name because for right handed users, “redd” could be typed with the hand that would typically stay on the keyboard and would 100% get an autocompletion. Alas, most users are now on mobile.
I use RES[1] to force the old layout (along with many other things).