I read some advice from an experienced academic about this which stuck with me (unfortunately can't remember who!).

If you want to keep people's attention, make every slide as minimally simple as possible. Like one diagram and maybe a few words. Listing out bullet points of full sentences might feel efficient but it's no better than just saying what you would have written. And lots of text is a lot more glaze-inducing for most of the audience. You can point to supplementary docs for detail.

Another idea is to break up longer talks (30min+) in two with some slides of nice photos you've taken.

Another reason to avoid walls of text on slides, is that attendees will spend the time reading the slide, not listening to the talk.

If you want to have something for attendees to refer back to after the talk, a complementary blog/whitepaper is a better idea than putting all your details in the talk slides

A pet peeve of mine are slides with walls of text. I put a few bullets or graphic on a slide mainly as a signpost for myself. By the time I give a presentation I've practiced enough that I can see any slide and go from there.