Why are some basic skills are far down language trees?
Like the title says, I've noticed in multiple languages that skills like numbers, colors, sports, and feelings are far down the tree. Why is this? Are these categories really that challenging? Thanks once again, Duolingo community!
I'd argue that they're not basic skills - they're basic concepts. Duo's method is to teach you basic grammatical skills through the medium of sentence repetition, rather than the method many courses take which is to teach you 'useful' things like telling the time and asking directions early on. Doing this means you're simply repeating a phrase, not learning a language.
It takes longer to learn to do these types of things with Duo, but by the time you can do them you're fully able to construct your own sentences on a variety of subjects. Other courses which 'teach' by giving you sentences to parrot with no thought towards how they're made don't do this.
Short version: many courses get you communicating quickly, but in an extremely limited fashion. Duo (among others) does it more slowly, but more effectively.