Form factor is one, also proper power management is very hard to get right with Pis. Of course we made our first prototype with Pi3, and it ended up looking li

Form factor is one, also proper power management is very hard to get right with Pis. Of course we made our first prototype with Pi3, and it ended up looking like this: https://i.imgur.com/gqUAdDa.jpg https://i.imgur.com/gqUAdDa.jpg :P Oh by the way we're not using HDMI display so it'll be cheaper (and thinner) too.