Well, you have to be far more specific in what you define for starters. If people are busy defining ranges from AAG6 to FFG6 to AAG9, it's a lot more difficult than simply say I want plot f5 and maybe f6. If you list the labels individually it could turn out to be a very long list, easy to make mistakes for both those choosing it and those reading to see available space. Buffers if used would have to be defined after that. If not used matching edges by bordering claims would be even more difficult than with a simple grid that they had in CWBP 1. In the meantime other people may have also mistakenly overlaped when deciding their ranges, or may misread the ranges or mislabeled them. For newcomers trying to figure out whats going on would have a much more difficult time trying to figure their way through such a complicated system. We'd also have to create an up to date map dealing with claimed areas and marking them off in order to get an overview. It would be more work to create and maintain such a map as opposed to just redding out large plots. Basically it boils down to the fact that the finer the detail the more labour intensive it becomes. Your system is fine detail, mine is hamfisted slapdash. But I figure if we make the holes big enough its very simple to put the wrong shaped blocks through... (that is a confusing analogy, but I like it so I'm leaving it.)

I have no problem with people claiming multiple plots. Given what I can figure from the other CWBP not everything will be mapped by a long shot. We will be working on a world level not a continental level ( or so I am assuming). Meaning that there will be a lot of space and very likely not near enough mappers to fill it all. I am for dividing the plots geographically rather than into a grid to help alleviate the problem of features being stuck in restricted zones to help with the problems list in point 2.

For point 1 I have no solution except to say that there will be a lot of available mapping areas, and also that people can negotiate to share a claim between themselves if they want. Other than that yes features will likely be locked for long periods without being worked. It is an unpleasant inefficiency.