Inventing something really new is pretty cool, but it's way expensive. We're more inclined to see if we can actually change the way people get around. That's why we've taken the best of mainstream, usable technology and massaged it into one package.
Lithium batteries used to only be found on the Starship Enterprise, but they've made it back to earth and are transforming the way we get around.
Alloy frames are established as the way we do things now. They're lighter than steel, very strong, and don't rust.
200w hub motors are great because they have no need to transmit power from the motor to the wheel. At 200w they're tiny, contributing to the savings you'll make from the first day you use your Greenmover.
The battery behind the seat post formation allows minimal power transmission distance from battery to the rear wheel, and keeps the weight central and low, making the bike easy to ride.
Speed is an interesting question. We all like to go fast, but more speed means less range. The speed we've selected is a compromise, taking all the factors we considered into account and giving us good travelling advantages, a good range, and a pace that is suitable for moving in traffic.