It is, in the context of reviewing public submissions to the directory. We don't require editors to work on specific tasks, as I said in my previous post, if an editor chooses to go out and find sites to list using other resources that is perfectly fine. We could have X amount of editors and all X of those editors could choose not to use the public submissions as a method to build the categories they work on.
Given the sheer volume of the directory unless ODP has "X" number of editors per category: It is highly unlikely (without machine intervention) that every subjected listing could be addressed, even if ODP wanted too.
Trying to measure things by editors per category does not really work for DMOZ. An editor listed at Arts/Photography can edit any category below that point. So Arts/Photography/Digital might appear to have no editors, but anyone with permissions to edit Arts/Photography or Arts/ can edit there.
I think it would be very difficult to justify ODP isn't low on resources.
My comment above was specifically aimed at resources and the speed at which public site suggestions are reviewed. In the context of the whole directory, we are always looking for new editors, the more editors we have the quicker the directory will grow and develop.