I definitely think GUI development is easier, because there's often no algorithms or math work.

I've never sorted or btreed or third normal formed or a* searched something. I've never designed a new machine learning model. I couldn't implement even a toy version of AES. I've never done a GPU shader.

I just find out who has, come up with a workflow model and UI that uses it, then track down all the edge cases that need a few if statements to handle, and maybe pack and unpack some bytes for a microcontroller.

I couldn't quite be replaced by a CRUD builder tool, because I'm doing embedded stuff, and a lot of CSS theming work... but it's not unimaginable.