Thank you, Greg!
Roli's software is definitely the most intuitive and responsive when using the Seaboard; I do use it with some other software instruments with various levels of depth and success. Even VOLT for iOS, which was designed for the "5D" control that a Seaboard or a Linnstrument utilizes, isn't quite as naturally responsive as Equator (I've messed around with a few of the other Roli-sponsored softsynths like FXspansion but I mostly try to focus on developing my understanding of Equator, since I'm not a great synth programmer to begin with).
I keep missing the opportunity to try the Seaboard as a controller for other hardware sounds -- I was in a studio session where the leader really wanted me to try using it to control a Moog Voyager, but we didn't have the right adaptors to go USB-C into MIDI in, so I didn't get to see how that would work (if at all). I wound up using Moog's Model D app on my iPad (which I absolutely adore sonically, but gets a little unpredictable with the Seaboard sometimes, particularly with modulation behavior).