I think I don't understand these. They seem too high level to actually be useful. There's a old Steve Martin skit from the 70s where he's says he's going to tell you "How to get a million dollars and never pay taxes...... Step 1: Get a million dollars ...". These roadmaps seem about that level.

Am I missing it? Are these actually useful? For example clicking backend the first thing is it lists 14 languages (although two of these items are not languages). How is that useful to someone? Which one should they pick? How would someone that didn't already know these languages and their strengths and weaknesses get useful info from that? Sorry I'm not trying to be critical just wondering how this is helpful.