If the current, single dark theme of Dynalist would be as pleasant and as considered as the dark theme of macOS, this feature request would not exist. 
Not sure, if you know that the dark theme of macOS has this magical feature called Desktop Tinting.
“When active, Desktop Tinting causes window backgrounds to pick up color from the user’s desktop picture. The result is a subtle tinting effect that helps windows blend more harmoniously with their surrounding content.”
So, in a way, macOS has millions of dark themes.
Are you (@Shida) using the stock Dynalist dark theme yourself, for longer periods of time? @Erica, are you?
When scanning long lists of bright text on almost black backgrounds, don’t you get these trails in your eyes? I do. On “dim” themes (as opposed to “lights out” or almost black themes) the light-trails are not so bad. This phenomena is the reason why I started this thread. I would love to stick to discussing this key idea.