The only part of the ST so far where Rey was a very enjoyable character to me was definitely the first half hour or so of TFA. Then she was OK until the mind trick, and after that it all went downhill…
Bro even Watto knows what a mindtrick is. It’s not a big deal when you look at it objectively.
I know what an airplane is. That doesn’t mean I can fly one. The fact that Watto’s species aren’t susceptible to a Jedi mind trick, doesn’t imply he knows how to perform one. Since his insensitivity is related to his species, it’s very likely a biological effect, and thus one he has no control over. The previous six movies make it pretty clear the Jedi mind trick is not easy to learn, and Luke only performs it by the start of ROTJ, when he’s had a few years of training and practise. Either way since TLJ makes it clear her powers grow stronger with Kylo Ren’s, it makes no difference how difficult it is to master, since those rules don’t apply to her.