This lively post by Aliette de Bodard at Chuck Wendig’s Terrible Minds blog not only defends semicolons but also encourages us to learn to use them well. My take: I’m an enemy of rigid rules, period. That said, there are some conventions writers really need to know, such as how to punctuate dialogue so it’s clear when it begins and ends. Readers get used to some of these conventions, and get jerked out of the story when their expectations are not met.
So whether to break a rule can really be a judgment call. Definitely: you best serve your prose if you know the rule, and the consequences of breaking it.
And by the way, I’ve been reading an awful lot of wonderful books that are unself-consciously replete with adverbs. I think I’m going to go back to some of my stripped-down paragraphs and slip those adverbs back in. Judiciously, of course. And in the dark of night.