She leads with fonts being the most important aspect of beautiful slides?

Sorry, that is very backward thinking. And not very helpful at all if you have to follow a style guide (like for your company).

Content is the most important thing for any slides. “Beauty” means keeping slides simple and to the point. Very simple graphical composition can go a long way.

I also am not a fan but personally of overly cartoony kind of presentations. It fits in some contexts, but when I see it in engineering or development it rankles me. Maybe I’m just old.