@Techaltar "Digital Drive" (or whatever you want to call bicycles where the pedals are connected to a generator) like the Rivian presented by you make most sense if they elliminate the drivetrain by using hub motors. The efficnency is actually not that bad on an E-Bike. Cyclingabout did a very in-depth overview of this technology that I can highly recommend watching!
https://www.youtube.com/watch?v=r-Zyp6jX0HM