@desolutionist To clarify, we took out "tag mirrors" when calculating winrates so it's not necessarily true that winrates will trend towards 50% as the metagame saturation increases. (There was a time when we didn't calculate excluding mirrors.)
@HouseOfCards Although knowing which archetype finished "first" in a daily is interesting, keep in mind that there is no way to infer what the metagame looked like from the data that is published--only 4-0 and 3-1 decks are published.
Also to answer your possibly rhetorical "What does it matter if ravager shops can win vs 60%(i'd still like to know how this number exists) of the field when blue-based permission is clearly winning the most dailies and placing in the top 3 most frequently?" I'd say the reason it matters is that it suggests that you should play ravager shops. I personally started playing shops because of this data. If your goal is to win a tournament you should care what an archetype's winrate is. To take it to an extreme and from a slightly different angle, if FOW is 95% of the field and shops is 5% of the field and FOW wins 70% of tournaments, it would be foolish to play FOW.
Whether winrate or conversion to top X rate is the better metric would be an interesting discussion. Personally I prefer winrate since we already have limited data and conversion to X can be skewed more heavily by the results of just a couple of matches.