"Learning curve" is much different than "some assembly required."
Learning WP consists of mastering its inherent operations, its admin panel, for instance, which is WordPress' seat. Basically, the learning curve for WordPress is about 30 minutes. It's learning how to operate WP as a functional program.
I didn't say WordPress isn't functional. It is. I didn't say it isn't useful. It is. I didn't say it isn't better than other options ... it has a lot of advantages. Another useful analogy might be particle-board furniture, which is also useful and very popular--but like WordPress, there is some assembly required. Just because particle-board furniture populates many American homes ... just because many people who buy and assemble this furniture don't find it particularly troublesome doesn't alter the fact that it requires some assembly.