No. I've only just started using StoryGraph, and as I'm primarily using it for the tailored recommendations, I'm only tracking what I read going forward to reflect my current taste.
If I add data for every book I've ever read, it's going to skew the data--Twilight, for instance, was a 5-star book when I read it at 16. I doubt it'd hold up now.
Over time my tastes willl continue to change... but SG won't be trying to cope with years of front-loaded data when it does.