Wheel and bottom-bracket mount mid drive motors are quite standard. Companies like Bafang and Tongsheng (not just these) sell motors that can go on any normal

Wheel and bottom-bracket mount mid drive motors are quite standard. Companies like Bafang and Tongsheng (not just these) sell motors that can go on any normal frame or in any normal (sufficiently strong) wheel and are compatible with standard drivetrain components. They accept and 36V or 48V (or anything 24-56V with some software tweaking and possibly lower power) power source. It is not too late to have standards here, we just have to stop buying the shimano, bosch and yamaha nonsense (even if they are technically a little better right now).