It seems though, that shimano has effectively taken several market chunks where no competition exists - I’ve yet to see a cargo bike or electric bike with a der

It seems though, that shimano has effectively taken several market chunks where no competition exists - I’ve yet to see a cargo bike or electric bike with a derailleur that’s not shimano. From conversation with some mechanics I gather that no competitor produces sprockets with the required strength to survive the increased torque. On some high end models you see Rohloff hub shifts or sometimes even pinion, but I’ve yet to see sram or any other. Granted, that’s observational data from my limited view, so I may well be wrong.