This is something I've been tinkering with for a while, but I think it's now complete enough to be generally useful. It's an alternative frontend for LessWrong 2.0, using the GraphQL API.
Features:
- Fast, even on low-end computers and phones
- Quickly jump to new comments in a thread with the "." and "," keys
- Archive view makes it easy to browse the best posts of years past
- Always shows every comment in a thread, no need to "load more"
- Log in and post using your existing username and password, or create a new account
- Simple markdown editor
- Typography enhancements
- Switch between fixed-width and fluid layouts and several different themes
- Easily view a comment's ancestors without scrolling by hovering over the left edge of a comment tree
Thanks to Said Achmiz for designing the themes and writing much of the frontend JavaScript.
Give it a try: https://www.greaterwrong.com
Macbook pro (just prior to the current generation, 2017)
To be clear, the grey didn't seem, like, impossible to read – it seemed within the window of reasonable design choices... just... somewhat lower contrast, for AFAICT no particular benefit. (Edit: I tacked on this disclaimer since I thought your question implied my experience was particularly dependent on screen tech, but maybe you were just being thorough)