I believe in the opposite, when it comes to presentations, you better include pictures and videos or even 3D render with animation, highlight words with other colors or size and so on, if I am for a plaintext slide, send it as an email, presentations are already boring using the default templates don’t make it worse. This whole “bare minimalistic” approach can be useful in some scenarios, just don’t try to force it every where, windows Vista UI for example was probably one of the best UI before going to minimal/flat design and such.
Both extremes are good. I've used Pure-Data and Unreal as daily drive
presentation tools for hundreds of lectures.
The former is really live coding, which is a great way to teach and
communicate. A complex presentation can be just like a bunch of boxes
(subpatches) connected together to do stuff - and its easy to build
almost like a "mind map" by connecting them.
For Unreal, I found the best way to teach game/VR concepts was from
within the world. It got tedious switching between PDF slides and the
engine, so why not just build a slide presenter inside the bare
constructor space.
As for plain text... I love it for presentations. Emacs org-mode is
perfect when you want to execute code via babel, and just see stuff in
a simple, foldable list, then dive down into the content.