These "dark streaks" would be way less of an issue. The reason you get light streaks is that exposure is really long and the satellites move quickly. The fraction of time a satellite is covering any given portion of the picture is really small. If you use, say, a 30 minute exposure, these "dark streaks" will be parts of the picture which only got, say, 29 minutes and 55 seconds. That's not a big deal.
The problem with painted satellites is instead that they're not black enough; they still produce light streaks since they're still somewhat reflective. I don't know if it's possible to make them non-reflective enough to make this a non-issue.
The problem with painted satellites is instead that they're not black enough; they still produce light streaks since they're still somewhat reflective. I don't know if it's possible to make them non-reflective enough to make this a non-issue.