I agree that a less bold bullet is a good idea. But the general design feels a bit inconsistent to me. I wonder what concept we should follow for the bullet coloring rather than defining specific values. When looking at the proposal, first thing I notice is that the bullet in non-active tabs in dark theme becomes hardly visible. This is because the background color of non-active tabs in dark theme is lighter than the one of active tabs and the different between active/non-active background color is more significant than on light theme.
When looking further, I see that the text color is different between active/non-active tabs in dark theme, while it is the same for both in light theme. Shouldn't that be a guiding factor? When taking a look at VS Code, that's actually what they seem to do: the bullet color is exactly the text color. In VS Code, there are more differences in text color (e.g., between active/non-active tabs), but having consistent coloring of text and bullet may still feel more consistent to users than adding further values that will produce inconsistent appearance in one case or the other?
Looking at the screenshot I now feel that the dot is misaligned with the text (not centered to the text) but that is also something for the next release.
Extracted from #3525:
From @HeikoKlare
For me: