I think it's more common in technical communities trying desperately to persuade people that their obscure low-level tech is not as obscure and low-level as it

I think it's more common in technical communities trying desperately to persuade people that their obscure low-level tech is not as obscure and low-level as it actually is -- for example Rust (but also Linux, C/C++, BSDs, networking, etc). The post is right: if you're explaining something, it's because the other person could not understand it without help, which means it's not, in fact, easy. It might be easy to repeatedly use it once you understand it, but it's not easy to grasp in the first place - otherwise you wouldn't have to be there in the first place.