Having the client available for Linux would open the possibility to build more affordable wall panels and with more intelligence. It could run on oDroid boards, RaspberryPi, etc. which in their place support a wide variety of affordable touchscreens.
Windows and Android panels are hard to control remotely, not always stable and need extra attention for updates. Linux is much easier to keep up to date without user intervention and easy to control remotely (in a secure way).
Customer support service by UserEcho