Hey! I'm the creator of Beekeeper Studio.
It's a similar value proposition as VSCode/Sublime Text vs IntelliJ. If you are in a database all day and need a big beefy IDE, Beekeeper Studio isn't for you.
I built Beekeeper Studio because I wanted an easy to use and intuitive GUI. I'm not a DBA, so using DBeaver or DataGrip required me to basically re-learn the whole app every time I used it, which I didn't have the patience for.
Hope that helps add some context :-)