I agree but let's be frank, these lists don't use a very scientific formula to calculate every player's rankings. With 100+ players constantly changing and some new players being added-up, it would be impossible to keep up with. Whenever someone has to rate someone else, they try to make an actual picture of their skills, compared to other players already in the list and give them a ranking supposed to represent their current form. For 90+, you might be easily capable to define in details what they are good at, but for many other, I think we agree its more of a general observation.
I am just pointing out that every player has unique skills and that taken out of a list's context, an 84 or a 91 doesn't mean much. Some players are not considered extremely powerful however they can possess one attribute in their skill-play which makes them rather complicated to deal with in a certain situation and I believe that's what categories would be useful at.
As we already pointed out, however, that's not a one-man job. I believe updating a list of active EU cavalry players is not an easy task if you intend to make it as accurate as possible. But would you consider getting the help of a few people to share regular opinions on such a list, then I would suggest again to bring more details to the picture.
We already talked about it on steam, so I think you know what my opinion is. I strongly believe that the mistake of several of these lists is to focus too much on trying to make an average ranking of all the strong individualities and denying the fact that we may not all be equal in term of skill, but we however all bring something to this scene. It's not that I dislike the current rankings, I think there are fun and I know that while many people will freely hate on it just to act like the cool guys who don't care about rankings, a lot check it on a daily basis and that's a positive thing because it keeps the competitiveness of the scene thrilling.
I just think there are many more categories in which people are capable to shine. Working on them is time confusing, and not easy to make accurate but at the end of the day, its what will make your list representative of the current state of the scene.