The problem is experience in jQuery and even Angular 1 are not relevant to the issue of why React (or even Vue for some) may be perceived as difficult. They use a very different model.

Emacs was very difficult for me when I first started learning it. It was much more difficult than using a simple text editor (and this was with 10 years of programming experience)! Yet I persevered and you know what? After giving it some time and learning it properly I found myself vastly more productive with the tool.

Some things don't lend themselves well to immediate gratification. If the OP provided even a hint as to why React was more difficult for him I'm guessing it's not something with React but rather that he was using two completely different state management solutions.