I fully agree! I never assume that anyone wants a critique unless it is specifically stated somewhere. If there's something major that is really bothering me and I think the author is worth it (really, really good except for this one thing), then I will email her about it (possibly). Although emailing someone you don't know very well with any kind of critique bears its own risk, as I have found out in the past! :-)
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I'm very interested to see where this goes, too!