No I don't because I'm stupid apparently (seriously?). But just to clarify, for me it doesn't make sense in this context because Arya has not finished her training nor this arc has led her anywhere except for the realization that killing "innocents" is bad (maybe). She had a list, she wanted to kill the people on the list, she wanted to get into the Faceless men because she thought that with enough training from them she would get the skills to kill the people she hates. She had plenty of time to get out of the organization if she saw something funny (there was funny stuff from day one) and she decides to do so know because she liked the actress and felt pity or something? Now, she is clearly not Book-Arya, where she is killing people left and right at every corner, but I'm not really sure what she is here. I kind of understand the feeling pity and not killing people out of the list thing, but all she has learned is to scrub floors and fight with a stick afawk. So that makes this arc a sort of filler in my mind, if the finality was to realize that killing "innocent" people without actually killing anyone (or witnessing other killings, because it seems the house of the Faceless is composed of two and a half people) in the process is bad... it all seems kind of pointless. That's what not making sense is to me.
That or I don't understand stuff, which could perfectly be too, of course.