Vincent,
First of all, thank you for taking the time to engage in this conversation. It's starting to get really interesting, and I'm really glad it's happening. For me, at least, this has been very fruitful.
I'm with your last post here, 100%. Makes total sense to me. Here was me earlier (a page ago):
"I'm not sure how changing the way its miss clause operates changes how other moves might lead into a Seize by Force. What about following?"
So, yes, I'm nodding along.
Edited to add, some idle musing: One of the things that occurs to me is that the nature of open-ended misses, in AW, is part of how the general stakes of play are set and manipulated. For instance, more "difficult" or threatening challenges are often represented not by a penalty to a roll, but by the scope of potential "miss" results.
As a group playing AW, we can use that consideration to pick appropriate "scales" for the moves. In particular, this is really important for "open your brain", which, otherwise, would be very difficult to "scale" - if the move were assigned a predictable miss result like "suffer 1-harm", a group could easily get into arguments about what is possible to accomplish with that move and what is not, since, both strategically and dramatically, we need to maintain balance with the scope of that miss result.
A move with a specified miss clause, therefore, implies things about the move's scope.
I always found the open-ended miss useful with "Seize by Force", since it can be rather abstract in nature. Sometimes the move can be "zoomed in" or "zoomed out" to focus on or to expand the action happening. A player has incentives to act on a smaller scale, however, since they don't always want to risk larger-scale fallout from a missed roll. I'm not sure what they dynamic will be like now, however, with a 'set' miss attached to the move.
Anyway, you (Vincent) seem to be headed somewhere, so please carry on. I'm musing to myself here; not trying to derail your train of thought.