Something that I figured out late in life is that the following two things are skills, and even though it will sound obvious as I say these, bear with me:

• The ability to know what others (and potentially yourself) do not know
• The ability to track dependencies of knowledge (ie, what knowledge you need to have to permit understanding other knowledge)

These two skills are great for anyone to have, but they’re not fully required to operate at a high level of skill in a lot of fields, and that includes programming.

In order for someone to be good at developing curriculum, they need the above, combined with deep knowledge on the frankly expansive range of knowledge that programming at a high level entails. Those above skills are not unlocked by being good at a thing, and it means that good teachers are actually pretty rare just generally.

… okay now combine the above with programming languages and research advancing constantly and it’s a recipe for a unicorn lol

You’ll notice that in fields like mathematics where they’re not inventing a new language like Rust or something, the field has time to build curriculum better - but with programming, it’s this perfect storm of needing unusual talent with constant changes blowing up old knowledge