> themes that are readable with any colour against the default backgrounds.
Yes, but then there are applications that set both the text and background colour. For example pamix sets the background to black, or tmux's statusline, or ngrok. And you end up in a rabbit hole trying to deal with that.
I don't know what pamix is but my rule of thumb is to use only apps that supports themes that are common in most terminals, text/code editor like solarized, gruvbox...
Yes, but then there are applications that set both the text and background colour. For example pamix sets the background to black, or tmux's statusline, or ngrok. And you end up in a rabbit hole trying to deal with that.