A significant part of @Smmenen's argument for the past three months has been that bad restrictions in the past will lead to more bad restrictions in the future. The dynamics underneath that argument deserve to be fully appreciated, and I'm not sure they have.
When you start warping a format to conform to personal tastes, as was done with the restriction of Gush and Gitaxian Probe, you invariably make the format less healthy. Format health is partly about what the metagame and the gameplay looks like, but it's also about the structure of the format. That structure gets weaker whenever you make invalid restrictions, and makes the occurrence of all types of undesirable things-- new cards come in and break something, more cards need to be restricted, or one deck being dominant-- more likely.
A format is like a vaulted arch ceiling.
You can't take a block away without compromising the structure, but some blocks matter more than others. There's no real point taking away the less important blocks (Gitaxian Probe, Dig Through Time) but there's also not a huge problem with doing so either. There's no upside but limited downside. You can move these more ornamental pieces around to change how things look without risking the larger structure's integrity.
Then there are the serious structural pieces (Gush, Mishra's Workshop). You can't take these away without consequence. Maybe the building doesn't crash immediately, but it's weaker. Sometimes the building isn't working in the first place (one deck's dominance being the normal and best reason), and you need to take a piece away.
What happened in this last case was that people were speaking out both sides of their mouth. I called them hypocrites then and I'll do it now. We were being told that Gush was integral to the format's structure– its restriction will significantly change the format (I still can't believe people earnestly claimed its restriction would weaken Workshops)– but mostly ornamental– the format won't be weaker, it will just look different. They had to make these contradictory arguments because they couldn't show that the format needed structural change in the first place. Gush wasn't too good, no matter how many times they said so.
My argument is both valid and simple: don't restrict cards needlessly. It doesn't matter how much you hate them. Gush was an important block in a healthy format. I made this argument at length last summer in an article called Decisions. When you take a block like this away, the format gets worse. When you take a good block away, the negative forces in the structure grow in influence.
Although Gush and Mentor were in the same deck, they exert opposite forces in the format's structure. Gush lessens the inherent variance created by the format's most powerful cards: Moxen, Lotus, and Ancestral Recall. Mentor exaggerates it. When Gush was legal, some people played Mentor completely without it. Nonetheless, they were so good in the same deck in part because their combination allowed you to capitalize on either type of draw. You had broken draws with two or more pieces of power in your opening eight cards and fair draws where you didn't but then just Gushed on turn three. Even still, it was not too good. The idiocy is that in an attempt to make a deck that wasn't too good worse, people got rid of the card that rewarded fair draws. Even if Gush Mentor was better than Mentor without Gush, it was also a more positive force in the metagame than Thoughtcast or Paradoxical Mentor decks. (This is another argument Menendian has had to make repeatedly)
I didn't hear Rich Shay complaining about Gush when Menendian was playing Trygon Predator alongside it; I heard him proselytizing about Restoration Angel and Fact or Fiction.
You don't like this one block in the building, but you can't remove it without collapsing the structure, and there's no reason to collapse the structure. You can make up all sorts of arguments about the block and say all sorts of things about it, but you can't change the fact that the block is important and removing it makes the building weaker. But you really don't like the block.
So what do you do? You do this.