I think a couple of factors enter into the whole thing and those vary a bit with each writer.

If I have a lot going on in 3D I try to either take a very small role or none at all and if I come in late as happened currently I don't jump in and prefer to enjoy all the great writing knowing that I will probably jump on the next one......or start it.

Also, many of these are "period pieces" and I have noticed it true of most regular writers including myself that if a particular period doesn't appeal to me, I don't join in or again, take a very small role. I think a few others do the same. However, the structure/vehicle/venue never seems to matter whether we're on horseback or on the river or in rods on the beach, everyone goes with the flow regardless!!!

Spaw