There is a disconnect in artists.
One of the best things I learned at Pactitle is,
"This is your shot. Nobody is going to come rescue you."
That meant that its my roto, my track[sometimes we would get camera tracks, or art for other sources],I keyed that. I know where the demons live. Most importantly I know how to keep the demond's at bay. Most importantly it is my problem. Find a solution.
The many steps a shot might take is a hard thing to juggle.
When you are getting roto from here and tracking from down there. There is no telling what might happen. There is a pipeline. Not the one you are thinking. But the one that goes from artist to artist. There is color space to manage. There is file naming conventions.It might be as simple as is the scan right. Does it match the ref. There are a lot of places for murphy to show up. You have to trust that everyone on the line can do what they say, and that it goes to plan.
Make sure you are talking to the other artists. If your the roto guy, make sure you know what the result of your work needs to be. Don't roto blind. Ask the compositor what is needed. Do you want soft edges or no filtering. If your doing a removal and there is going to be a huge cg alien comped in, it might help to know that, if your painting out a background element. Green screens, know, or have a general idea of what is being comped. If your a match mover a tip of the hat. If the track is off, what do you got. That's right, nothing.
Don't forget to thank and tell the other artists that contributed when you get a final if your the last to touch the shot. Everyone works hard. It's nice to know what you contributed, worked.