Having in mind your point about the Seaboard, another reason for hammer action is the haptic feedback. It’s super illuminating to think about the options that open up for extending traditional keyboard design with musically useful haptic feedback once we kick the wheels of the piano paradigm. That seems to be the route Osmose is following.
I’m with you on the Seaboard’s unusual feel. It’s an excellent source of haptic feedback.
For me, this discussion and the Osmose announcement bring out the importance of the way haptic feedback and gesture integrate in MPE controller design: between how the controller feels, physical gesture, and musical gesture (minimally at the abstract level of midi/osc/cv message).
With that in mind, one of the striking things about Osmose is that it seems to be exploring the opposite direction of the Seaboard’s feel on how to integrate MPE controller haptics and gesture relative to the normal feel of a keyboard/piano. E.g. the feel of skin making contact with a traditional key is normally there, but left for dead. Likewise for the feel of a mechanical key’s travel beyond the note’s attack. Aftertouch normally extends that by adding some range of haptics and controller gesture at the bottom of the key’s travel, but it leaves a ton of untapped musical potential in the key’s travel. It’s like Osmose is asking: how can we extract more gestural control out of the normal feel of a mechanical keyboard. (By contrast, the Seaboard’s approach is more like proposing a new direction for feel/haptics, while nonetheless preserving as much as possible of the layout of a piano style keyboard.)
It’s also very striking that they decided to leave out something as obvious as the X/Y position of the finger on the keys’ surface. On the one hand, there’s normally no haptic feedback about X/Y position on the key’s surface. On the other, unlike e.g. being mindful of the relative location of the different keys before hitting them, being mindful of X/Y position on the key’s surface is not a normal, intuitive part of what people pay attention to in learning how to play mechanical piano style keyboards.
Also, where they most obviously extended the mechanical range of keys, with side to side travel for pitch, they did so in a way that is about as intuitive as it gets even to non-musicians: side to side motion for pitch bend/vibrato, like with strings on a fingerboard.