@stormanimagus Without the one-sided and uncounterable Human 'fun police' we'll still have enough complex and fascinating decks to play against that keep blue decks in check.
Comparing PO and Jeskai Xerox isn't really 'getting down to the nitty gritty.' It doesn't matter if these two decks share many cards. How many cards some deck shares with another deck is insignificant if the decks as a whole play completely differently. In fact, to use your terms, Xerox could often be considered 'fun police' for PO, except the games still manage to be more interactive than blue vs hatebear games, despite PO being involved.
Also, regarding your response to evouga, 'almost all decks running power' is not the same as 'almost all decks running all moxen.' It's a fact, as you probably know, that there are many successful decks in the meta right now that don't run all moxen. So it isn't 'an automatic in a customizable card game' to run all moxen right now. Even without cards like Lavinia. Even without any literally one-sided hate card at all, I doubt all decks would want to run all moxen. Beyond some point it's just inefficient to include what amounts to colorless mana when you could be including spells instead.
In my opinion, hate cards that help nurture interesting deckbuilding and gameplay usually affect both players. The one-sidedness of hate cards should be the result of a board state produced by appropriate deckbuilding and in-game decisions by players in consideration of symmetrical effects, so that there are aspects to play around, play into, untangle, etc. for both players. One-sidedness should not be literally written on the textbox of single 2cmc cards that you slam onto the table turn 1, then again if/when it gets removed, so on and so forth.
Obviously what is 'interesting' depends on what you want from the game. But I think the majority of Vintage players, regardless of whether they play Shops, Xerox, Combo, or whatever else, are attracted to the format because of the many complex, or outright convoluted lines of play that emerge each turn as a result of the interactions among the cards in play and the cards that could be played. And this kind of gameplay is slowly being reduced as each new set brings more one-sided 'I don't care as long as I win' cards that are the result of WotC pushing what they think will be most popular with casual players, rather than promoting the kind of gameplay that many Vintage players love.
This is understandable, as WotC is a company interested in selling product. But in order to preserve and develop the unique intricacy and resulting appeal of Vintage gameplay, it may be necessary to simply ban some of these new cards that too easily reduce possible lines of play. Card diversity for the sake of card diversity doesn't necessarily promote engaging (or diverse, if diversity is important in this context) gameplay. I would rather play in a format with a smaller card pool, more card interactions, and more possible lines of play, than a format with a huge card pool with less interactions and less possible lines of play.