But I'm not aware of anything similar from other manufacturers.
Is this an arms race Bosch will win through marketing? Vhs vs betamax?
no, it's simpler than that.
Bosch, Yamaha, Brose, Shimano, Bafang etc make bikes with torque sensors.
You put in X, the motor is programmed to deliver 1X, 1.5X, 2X, 3X etc. The bike computer asks the battery how much charge in WH it has left, works out how many WH 1X, 1.5X, 2X etc is, divides the charge remaining by usage and displays the miles or kilometers left in the tank. So it's nothing unique from Bosch.
There are some Chinese bikes fitted with torque sensor too, they do the same, show you estimate of mileage left. However, most cheaper bikes have simple cadence sensors, they let you pedal as much or as little as you like but can't work out how much effort you put into pedaling. They can only show you how much is left in the battery but not the expected miles.