Function over form. If fancy scrollbars make it harder to use, then they should be gone. Design should never trump utility.
Wouldn’t this look completely off with a massive light mode default Chromium scroll bar in the middle of everything? When I was developing that my main goal was to get the UI looking consistent and clean so it would feel good to use, which I think is an underappreciated thing; if your UI doesn’t “feel right” then people won’t enjoy using it no matter how functional it is
To be fair it probably does have contrast issues which I could improve
Note: it’s an Electron app so maybe that’s different
Now the only remaining use case is when designers don't design components around default scrollbars. Sometimes the default one just looks too big compared to the size of the component. But this can be solved with design (don't cram stuff into small fixed boxes that then need to be scrollable).
What’s the difference between styling a scroll bar and, say, a button in an application like this? If you want everything to look how the user prefers and fit into the OS then you shouldn’t really style anything at all
Yes, which is why that design is wrong. Respect @media(prefers-color-scheme). Forcing a light or dark background causes readability issues for some people.