Let me start by saying Mental Misstep:
- Is not broken
- Does not fit the guidelines for (vintage) restriction
- Vintage is in a pretty good place
That said, Misstep is by far my least favorite unrestricted card. I am a brewer at heart and Misstep does impact my ability to brew a consistently competitive deck.
While there is a good variety of viable decks, there are really only two viable castable archetypes right now - counter spell based deck or lock based decks. The other decks either don't have to cast spells to win (Bazaar decks) or only need to land a single spell (Oath decks)
With Misstep so heavily played, any deck trying to fight outside these spaces need to give up their opportunity cost of using limited early mana to progress their board state with one drops while the Misstep deck can progress their board state without need to use that limited early mana.
This keeps out more than just the more common known decks like welder decks, crop rotation decks, or ritual decks. It also stops yet to be proven potential decks like infect, non-prison zoo, and skull clamp decks.
The good news is that with the benefit of the rise of Survival Salad, Misstep has even fewer good targets. If the meta shifts enough that Misstep is dead more often, the number of copies will shrink. It looks as if this is already happening.
The one thing I think we can agree on is that we won't all agree. I will forever desire for shifting metas. Others like as little change as possible. Neither is absolutely right. Unless WOTC decided to start banning Vintage the same way they do Modern, I'll have to settle with playing decks that I am less excited about. At the end of the day, these are still pretty fun games - even if I feel the deck is stale.