You are taking valence’s point so hilariously literally to the point you have actually completely missed their point. They aren’t saying “the fact that you move is bad game design” they are saying “the fact that in the modern game the only way that mechanics resolve themselves is move here->something resolves->move here->something else resolves” is tired and limiting to encounter and job design because it removes every other facet of potential encounter design (the “everything is just stack and spread” is proxy for mechanics being solved by them just exploding around the player as the player moves in a calculated dance)
This is why M6S’s add phase is being so highly praised; because the resolution of it doesn’t just involve moving around in a calculated way while the mechanics go off around you. It forces you to move the mechanics around you
If you take valence’s point as simply “the fact you have to move is bad” then yeah sure their point seems strange, but that’s because that’s not their point