The way I see it, Arturia seems to like to differentiate between the devices built for controlling mostly external hardware and the devices built for controlling mostly software. The latter of which have profiles built into their V Collection synths.
I ended up buying a KeyStep because I wanted a small-profile keyboard to compliment my KeyLab 88, but it MUST have Aftertouch, not least for getting the best out of Arturia's own virtual synths, especially the CS80 which relies heavily on it. None of the MiniLabs have it, despite using basically the same keybed. Most of the features on the KeyStep I'll never use.
So my 'outsider looking in' understanding is, it's not that Arturia don't care, it's that these KeyStep products aren't primarily aimed at soft-synth users, so Arturia don't prioritise this task, and they would instead sway you towards a KeyLab if your workflows are software-synth centric.
In my case, if one of their MiniLabs had Aftertouch I wouldn't even own a KeyStep, because the MiniLabs have way-better integration with the Arturia software using the predefined templates.