How is that ironic? Thoughts have to be stored somewhere and databases happen to be really good at storing things.
Databases are indeed good at storing millions and billions of things and they are designed for it.But no human being is individually capable of creating content that really justifies a "dynamic programming oriented query plan generation" each time someone wishes to access his thoughts!
tl;dr My argument is that static site generation for personal blogs is common sense!
Also, creating content using a web-based editor that saves to a database is very easy for not-so-technical people to wrap their minds around. Static site generators? Not so much.