@sovarius The issue with Spell Snare is it doesn't always hit the key cards in the mirror. You are right that Xerox really comes down to a battle of attrition, and so the key cards are generally those that create a substantial amount of card advantage. Things like Ancestral, Dig, Cruise, and Planeswalkers. Misstep stops Ancestral and protects your key cards from Pyroblast. Pyroblast hits almost all of them (exception being Sylvan Library and nonblue walkers). Flusterstorm is great when played well and the dream scenario is Dig in response to your Dig, counter both your Dig and Counterspell with Flusterstorm. People wouldn't play these cards if they weren't great in this matchup. You gain more in the Blue matchups than the increase you get from running Snares and Pierce against Shops (and having them in against Blue). It's a matter of rational deck building.
To everyone, there is room for discussion here on what can be done or should be done against Shops. It doesn't necessarily require hitting Shops, now. The current discussion is more complaining about people complaining or making irrelevant arguments like "the deck plays 5 black lotuses" or "it doesn't draw cards and doesn't kill turn 1". Believe it or not, I'm undecided on what should be restricted or if it should be restricted - the data from the challenges this month paints a different picture, but it's unclear if this is an overreaction to Shops (again, every deck is beatable and give other Vintage player's credit - they know how to beat it) and as the focus shifts back to blue, the equilibrium point for Shops returns to an unbalanced win percentage. What I really hate and find frustrating is bad arguments made repeatedly.