Sometimes it's easier to discuss the tactics with exact numbers than in general. I have no problems in posting something like "you need PA at the same level as your opponents OD" or "your ID and SB should be close to your opponents IS". We tried this in Germany. But there was always the wish for an example with numbers.
The exact numbers so frequently discussed apply at a particular division, and often the discussions are of the very top divisions. The relative skill ratings are no less important and are applicable at all divisional levels, I think, in pretty much the same way. It seems that a discussion with ONLY numbers or ONLY relativity is a discussion of one hand clapping, though I get more out of the discussions relating skills or describing patterns of skills than I do out of discussions of top-division players.