I took another look at Monsterhearts as a way to do PbTA rolls right and it's actually a really simple solution. First, all the moves are essentially opposed actions (the Lash Out Physically move essentially compresses an entire fight into one roll), so it makes sense to only succeed partially and also you don't need to roll on things where there's no opposition. So unless you're trying to kill or seduce someone with the sandwich you're making, you make the sandwich no problem. (And the problem isn't driving a car without crashing, it's talking your dad into letting you borrow the car.)
Second, the consequences for partial success usually have defined mechanical effects, so it's very hard for the GM to make your dick explode or generally screw your over without your consent. The partial exception to it is the Lash Out move in Monsterhearts 2:
When you lash out physically, roll with Volatile. On a 10 up, you deal them harm, and they choke up momentarily before they can react. • On a 7-9, you harm them but choose one:They learn something about your true nature and gain a String on you,The MC decides how bad the harm turns out, You become your Darkest Self
So you can potentially make someone else's dick explode. The basic moves are a pretty good example of how Monsterhearts 2 is defanged compared to the original version too.
This is how lashing out works in the original:
When you lash out physically, roll with volatile. On a 10 up, you deal them harm and choose one: the harm is great (add 1); you gain 1 String on them; they need to hold steady before they can retaliate (during this scene). • On a 7-9, you harm them but choose 1: they gain 1 String on you; they can deal 1 harm to you for free, if they want to; you become your Darkest Self.
Not only do you have more options when rolling 10+, getting harmed back when rolling 7-9 is a lot more relevant as a consequence than letting the GM describe what damage you do. (And since Darkest Self lets you be a dick as much as you want, it's sometimes the desirable outcome.)
Not to mention that forcing someone to Hold Steady gives that particular move some relevance, since it's otherwise something you'd never roll willingly.
Same goes for the Turn Someone On move (one of the few where the target chooses the consequence of partial success):
Turn Someone On (Original)
When you turn someone on, roll with hot. On a 10 up, take a String against them. • On a 7-9, they choose one: give themselves to you, promise something they think you want, give you a String against them.
Turn Someone On (Version 2)
When you turn someone on, roll with Hot. On a 10 up, gain a String on them and they choose a reaction from below. • On a 7-9, they can either give you a String or choose one of the reactions.I give myself to you,I promise something I think you want, or I get embarrassed and act awkward.
For rules on asexuality and non-attraction, turn to page 49.
The asexuality rules already break the game pretty bad. Turn Someone On works like Shut Someone Down on asexuals. In essence, it lets you use your Hot stat for a move that normally requires the Cold stat. It would be a decent rule patch, but the ability to roll a move with your strong stat instead of a stat you're mediocre in is extremely good in PbTA. (See the post on how much effect +1 can have on your chances of success.) Plus, probably the most famous line in the Monsterhearts v1 rulebook is 'We can't choose that for our characters.' in reference to getting turned on involuntarily by people we might not find attractive.
The "I get embarrassed and awkward" option is just weak and bad. It gives an easy out of an uncomfortable situation. The 'They promise something' option might seem the same, but the Fae skin exists and they get bonuses to rolling against people who broke their promise to them (and they have a move that gives them +3 (!) to rolls for Turning Someone On). I also appreciate that full success in the original is just you getting a String. You Turn Someone On in the game, not because you actually want to fuck them, but to prove your superiority.
Sorry to sperg so much about Monsterhearts, but it's the only PbTA game I played extensively. Though I won't play it again, since I played pretty much everything I want in it. Which I guess is another weakness of PbTA: even if it's a good game, there's only so much you can or want to do with it. Even if Thirsty Sword Lesbians was a good game, how many games about that exact scenario you want to play? It's easier to just make a female paladin with a sword in DnD and say that she's a lesbian.