Yeah, I have no problem with a figure from a blink-and-you'll-miss-it scene. I bought the ESB Han Solo in a trenchcoat as he's working on the Falcon figure in the TVC line. I want a Dagobah Landing Luke even though I have Snowspeeder Luke and Dagobah Luke. I don't hate on this figure existing.
The issue for me comes from the lack of figures for other main characters from the sequel trilogy while we get yet another Rey. People have already mentioned Ben Solo (which I would get) and a TROS Emperor (which I probably wouldn't, since I didn't like anything about him in the movie). In addition: we don't have a Finn or Poe from this movie. No Aftab Ackbar or Nien Nunb (RIP). And we didn't get an Old Lando or a Memory Han Solo (which would double as a needed update for TFA Han). We didn't even get a General Leia from either TLJ or TROS.
I know, I know...people here hate the sequels and any figure from them would be bad and dumb. Hey, maybe this Rey will sell because dark side figures are cool, people like red lightsabers, folks see custom opportunities...or because it ends up being a great figure. And maybe any other TROS figure would go nowhere...again, I am not a fan of that movie. But if they are going to bring out more characters from it, I'd rather get more characters instead of the same one again.