What I'd like to add is that betas in fanfic are the same as authors: doing this for fun. Fanfic authors want their story to be fun and exciting and as good as they can make it, but I wonder how many of them would shred the whole thing and start again if a beta suggested that they need to completely restructure the plot.
Writing with a view to publish professionally is different. It's... I see it as competitive writing if that makes sense. I'd shared a chapter with my writing group and, based on their feedback, went and rewrote the first half entirely. Would many fic authors do the same when they have a completed story they've worked on for weeks? In that case, if I were to beta such a fic, I might suggest ways to make the scene stronger, even if it's a complete dud, instead of suggesting they rewrite it (unless the author was up for it). With original, the suggestions don't involve only making a chapter stronger. It has to stand out, it has to hold the agent's attention past the first page, it has to progress X Y Z etc. So if I need to rewrite it 5 times, I will.
(OK I'm more or less the same in fic, but I don't know how many other people are like that)
This is also to say that a lot of my thoughts at the moment revolve around a different field than fandom so they're bound to be different to what you're asking.
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Writing with a view to publish professionally is different. It's... I see it as competitive writing if that makes sense. I'd shared a chapter with my writing group and, based on their feedback, went and rewrote the first half entirely. Would many fic authors do the same when they have a completed story they've worked on for weeks? In that case, if I were to beta such a fic, I might suggest ways to make the scene stronger, even if it's a complete dud, instead of suggesting they rewrite it (unless the author was up for it). With original, the suggestions don't involve only making a chapter stronger. It has to stand out, it has to hold the agent's attention past the first page, it has to progress X Y Z etc. So if I need to rewrite it 5 times, I will.
(OK I'm more or less the same in fic, but I don't know how many other people are like that)
This is also to say that a lot of my thoughts at the moment revolve around a different field than fandom so they're bound to be different to what you're asking.