Great initiative, but the proprietary expansion cards are entirely counter-productive to maintainability.

The expansion cards will only be available for as long as your company provides them. Using the most-commonly used, mass-manufactured standard interfaces for components would provide more long-term repairability and upgradeability.

The trade-off would be in design resulting in more bulk and in the economics of your company, of course. It seems cynical to me to sell maintainability while starting a walled-garden ecosystem of proprietary hardware.