@smmenen Perhaps my reply was too terse. Your final point about thorn and (potentially) chalice being unrestricted is what I was getting at. These restrictions were anything but tailored--they nuked archetypes to save workshop from restriction.
Perhaps the DCI was acting to save a sacred cow, but in my framework presented in this article, 'saving workshop from restriction' is not an end in and of itself. Rather, the value of Workshop is instrumental to format diversity, in that it supports the existence of a range of archetypes and strategies that would not, presumably, exist without it. At least, that's likely how I would have viewed it were I the DCI deciding to restrict Golem.
The most broken reasonable-to-achieve hand from modern workshops is shop, inspector, mox, and lock piece. The odds of having 4 mana for this sequence go down significantly if you restrict workshop. I don't have a problem with a fast affinity aggro deck in vintage. The problem is that the workshop buys the deck too much tempo with a lock piece or two to kill the opponent before they can regain control. The fact that it makes bigger ballistas to mow down a board of helpless humans is the other half of the problem.
I wasn't arguing that restricting Workshop wouldn't have any effect. A narrow tailoring inquiry just tries to match the means to the ends in a narrowly tailored way to minimize collateral effects. Thus, any narrowly tailoring process needs to have a 1) a clear definition and understanding of the problem, and 2) a theory or prediction about the effects of any particular intervention.
Suppose that my facts are right, and that Shops is about 30% of the metagame, 25% of Top 8s (which it was in the April, 2018 Challenges), and 55% win percentage, and we all agree it's still too good. What is the goal we are trying to achieve? (I actually believe that Workshop underperforms in the post Champs to present metagame relative to it's 'actual' power, which I expect to be similar to last year's NA Vintage Champs.) But we have to be clear about our goals, because narrow tailoring is all about means-end fit.
Suppose that two things are true:
Restricting Ravager would cause Workshop Aggro to fall, to say, 27% of the metagame, 22% of Top 8s, and a 53% win percentage
Restricting Workshop would cause the Ravager Aggro archetype to fall to 17% of Top 8s and a 52% win percentage.
Both seem plausible. Obviously, there is a wide range of possibility around both predictions. But supposing that those are decent forecasts. What is the more narrowly tailored option?
Narrow tailoring assumes that there are multiple means by which you can achieve the same ends, and you take the least collaterally damaging path. Unless you tie the restriction of Workshop to the possible unrestriction of multiple cards, based upon those assumptions, restricting Ravager seems like the more narrowly tailored choice.