No, it's not that bad.
TILE MASKING. As a contributor on the quack quack board, someone that's watched it unfold, I find it odd and inconvenient that as tiles are approved, the masks change. I'm not referring to tiles being revealed once all adjacent tiles are approved, but rather the tiles that are still masked, the 10px strips come and go.
For instance, I'm working on the top-right most tile right now. The tile just to it's left, by "matthewgarret" previously had it's lower portion visible. Now, since Sakket turned his in, it's covered up. Before getting masked over, with no warning, it contained what I considered to be a key reddish blob I was contemplating propagating over into my tile for an added sense of continuity. Had I not already screencap'ed, that pixel information would lost. Do you see the problem?
Why not just consistently mask only the inner 80x80 area? Our previous Hexquisite collabs did this. It seemed to work great.
Further, you look at the C64 Checker Collab, it's slowly being taken over entirely by pure black. I think artists should have a better sense of what "might" be going on in the black area. It is valid for reference when making more tiles; I don't just look at adjacent tiles when making mine.