We appreciate the feedback! (Designer of the RBlind themes here).
We originally wanted to increase the thickness of the lines (and change the colour) of the post nesting next to comments, however these elements in particular are hard coded outside of all CSS themes and are inserted by some dynamic code that will “count” the number of comments in order to nest them correctly and add the style accordingly. So it is a limitation we cannot change (yet).
We’ve made a Github Issue about this, requesting for the lemmy-ui to define the thickness and colour inside CSS so theme developers can edit them: Define comment tree post left-border colour in CSS #2890 and Define comment tree post left-border width in CSS #2889. Once lemmy-ui address this issue we will be able to style the comment nesting border differently.
I would personally really like to change this as in web design it is best practice to separate style from function and for the most part the Lemmy CSS themes do this, but this is one area where they don’t.
Hello, RBlind Lemmy theme designer here - we appreciate the feedback!
At least in terms of post nesting, I made another comment about this but the short of it is that our ability to change it is limited right now because the values relating to the width and colour of the left border is not defined in the CSS: Lemmy RBlind Post about Comment Nesting Styles
You make some good points about the dividers and distinguishing comments being different for the Light and Dark theme. We can look into if things like the comment fields can be made larger, as well. This theme is still in alpha so we appreciate all the feedback we can get at this stage.