For me dropwizard looks like what you'd get from a room if experienced Java guys picking the best of breed to do one thing and one thing well.

Spring boot feels like it was from a room full of people where there's a guy in the corner with a form of tourettes that makes him keep yelling "Spring! Take the Spring option!"

It just isn't always the best option and sure, you can often switch out for something else but that defeats the point of an opinionated collection of the best available choices.