Rather than declaring that the majority of vintage players are dredge-hating, shops-not-respecting, derpstep-loving, hyphen-overusing, netdecking troglodytes, let's do some analysis.
I'm going to make the bold assumption that I intelligently craft a deck with the intent of maximizing my overall winrate. To simplify the discussion let's say there are 3 archetypes: Blue (B), Dredge (D), and Shops (S). My expected winrate is then (ignoring subtleties) the dot product of the % of each archetype at the tournament times my winrate against that archetype. That is, OverallWinrate = Meta_B*Win_B+Meta_D*Win_D+Meta_S*Win_S.
I'm going to construct a deck the way I suspect most people who have time to test do: choose a decklist from an archetype and fiddle with it to try and maximize my winrate. I'm going to be a blue player for this.
Observation #1: Meta_B is way bigger than the other two. This means that even if adding a 4th misstep causes Win_B to go up just a little bit and I incur a slight hit to Win_S (how this affects Win_D is less clear), I've still likely increased OverallWinrate.
Observation #2: Changing Win_D significantly can increase OverallWinrate, even if Meta_D is relatively small. There are cards I can add to my sideboard that are very good against dredge (RIP, Crypt, etc.). Let's say I am deciding on the last sideboard slot. Shops was 17% of the meta and dredge was 10%. I can either add a card that is solid but not gamebreaking against shops, or I can add the 2nd RIP to increase my dredge winrate significantly. I don't run lots of dredge hate because I hate dredge, I run it because it has a significant return for the investment. If I expect some incredibly low dredge %, like the low single digit percent it was on MTGO for months, this analysis changes and I skimp on some dredge hate.
So why has shops been the dominant deck for years? It's because Meta_S is consistently "smaller than it should be" and I don't have the same sort of haymakers I can put in the sideboard as I do against dredge. The closest thing to RIP against shops is Oath of Druids, and that's not a card I add as a 2 of in the sideboard of my Xerox deck.
I shouldn't be messing with missteps at all; I should be jamming workshops. I didn't decide to run 4 missteps because I don't respect shops; I ran them because I wanted to play blue and maximize my winrate given that affinity.