Beamer popular with people that need to add lots of equations. It’s easier/quicker if you know your greek alphabet and have several equations.

Beamer is the slide equivalent of latex. Even among latex users, PowerPoint seems more popular. If you’ve written the paper and are going to present it, you can just take the equations from the paper as screenshots so the big advantage of beamer is nulled.

I think reveals target market seems to be web developers. It’s html slides so might be easier if you want that workflow.