A possible problem with patching the Ambiant-MATE (non dark) theme for the terminal is that someone using custom colours may prefer a light background - in which they see the new, unwanted dark scrollbar. Then again, do most users work in a terminal with the default/dark colours to justify that?
My terminal has a light background
My terminal has a dark background (or the default)
What's a terminal?
0voters
I remember in the past (maybe 15.04 or 15.10?), the terminal's scroll bar was actually too dark posing some contrast problems.
On a slightly related note, I was recently making some minor tweaks to the theme for 19.10 to try and visually adhere to what we had in 16.04. This was actually my first attempt at tweaking GTK themes, since I'm not actually familiar with them.
Since 16.10 with the move to GTK3, the underlying toolkit changed from GTK2 to GTK3. So some things may not look "exactly" the same any more, like alternating row colours.
