There's a reason why so many keyboard players adore their Nord keyboard, despite it having relatively old-fashioned technology. Nord instruments are incredibly ergonomic and sound absolutely killer, largely because of their obsessive attention to detail and their deep relationships with working musicians. A trivial example is the music stand - it's rock solid, it fits in the gig bag, it slots in place in two seconds and it's wide enough to hold four pages. It's a really important feature for a lot of Nord users, but it just wouldn't occur to most engineers.

Pressed steel, Neutrik jacks and keybeds aren't subject to Moore's Law. High-end stage keyboards will always be expensive, because they're built to high standards in relatively small quantities. The lack of innovation just isn't particularly relevant, because old technology does the job perfectly well.