Plot holes (spoilers included) in RotE

[Nuytsia]

Repelling seems like such a powerful weapon to use against the unwitted. Also in defence, as Fitz uses it against Galen to prevent his blows from causing damage. Fitz even says that it's use comes instinctively to the witted. I would have thought that it would not only be useful in almost any fight, but pretty much automatic. Yet Fitz and other Witted ones seem to rarely take advantage of it, and throughout the series I wondered why.

I just re-read Assassin's Apprentice and it struck me that Fitz actually uses repelling quite a lot, UNTIL the time when he repels at Burrich ...... where he tells him NEVER to do that again ...... but he does right away ..... and gets it reflected back at him....
After that (for the duration of AA) I don't think Fitz repels again.
I guess maybe the confrontation with Burrich put him off doing it ... at least for a while.