I disagree. The flashback is a tried and true method of adding context to a story or detail to a character's motivation. I understand if all you want is to fap to the next schoolgirl how it can be a distraction, even when the flashback comes with its own fapping scenes, but it is a valid way to progress a story.
And you can skip most of them, iirc.
And you can skip most of them, iirc.