Pro and high level players choose their decks according to the meta and what they feel would be the best strategy. In theory this is the best way to do but in the real world they are just a very small % of vintage players. Most of us are just playing one kind of deck (or a very small number of them) because it is the kind of deck that suits our playing style and we have fun with it (another reason is card availability/price of course but that is not the point here).
From that point, the (theorically) best metagame would be the one where each 'playing style' can be incarnated by at least one deck (several would be best of course). As an example, i am just very bad at playing combo decks : whatever the deck or the format and how hard i try ... i always loose. It is just not my style. On the other hand, i know players that seem to be always playing combo decks whatever the incarnation or format (storm, belcher, elves, ....). I don't know what would be an adequate list of 'playing styles' but i presume you understand what i mean here.
I won't come back on what has been said on the classification of decks from a meta management point of view, but what i just said can put a different light on that problem. Note that i am advocating nothing nor judging here, i am only trying to put some light on the facts :
Let's have a look at the recent restrictions as an example : golem, chalice and thorns restrictions lead to the fact that prison shop does not exist any more and shop archetype is now only ravager builds. Let's see how people react to that :
- For 'blue' players a shop deck is a shop deck and they don't care about the details. So they look at the numbers and see that shop archetype as a whole is still high so they scream "Nothing changed, we need more restriction and so on ..."
- Aggro shop players are quite happy (i presume)
- Control/prison shop players are frustrated. Unless they find another deck in the format that suits their style (and they can afford to play) they won"t have much fun. They could try ravager decks but it is a really different style (same difference as between 'Death & Taxes' and '4C control' deck in Legacy for example).
So basically the result of those restrictions is that the overall frustration of the vintage communauty has increased. Maybe they were a necessary evil, i don't know and i won't judge but this is a result that can explain some of those endless talks on that topic.
My conclusions are :
- Some amount of categorization is necessary because it is not the same people who play decks that could look very similar from a quick glance. 'Playing style' could be a criteria (i don't know if that can be done practically or if it would lead to something different from the usual criterium).
- Statistical are great but they are tools, the real stuff are people who are playing.
- The 'perfect' metagame for me would be one where any new player who wants to try the format and looks at the available/competitive decks could always find one that will suit his playing style and have a reasonable chance of winning with it.