Thanks. Yeah good call on the lack of color in that one. Here's a better example https://youtu.be/44pNDuRO77g?t=269 , it's straight to a point where I'm in a vimrc file with about the smallest text I ever use on video. I'm guessing the comments would be pretty hard to read in a high sun light area, that's my only complaint with the One theme -- the contrast on them is a bit low.

In the video you linked I see what you mean. I haven't tested it outside but just eyeballing some of the screenshots in the presentation the blue function names are likely impossible to read, the dark orange / red module names could be borderline too since it's kind of dark text on a dark background, and even the green atoms are a bit similar to the background in terms of darkness. I'm not sure what color theme that is but personally I wouldn't use it.

I try to stick with One and Gruvbox. Both have pretty decent contrast ratios for both light and dark variants. I have 1920x1080 screenshot side by side comparisons of both with dark vs light in my dotfiles at https://github.com/nickjj/dotfiles.