>>12991>>12992The screen is the single most expensive component when designing a handheld device. Raising the cost of a handheld by at least 30% which would be useless outside of the DS library seems like it would severally limit potential sales and almost 100% guarantee Nintendo would do everything in their power to send you to federal pound me in the ass prison.
Rumble is a massive drain on power and would significantly increase the form factor.
Button joysticks are pretty much a given.
Accelerometer usage entirely depend on the games that require them and the amount of sensitivity needed. It is extremely simple to slot them on the motherboard, but it would raise the price and I can't think of any game off the top of my head that uses them outside of Roco Loco. For the clamshell cover wouldn't the handles with the controls serve the same purpose. 16:9 is pretty standard nowadays.
HMI touchscreens are a little difficult to program for, but it can be done. I just don't know if the DS roms that are available have the touchscreen features baked into them.