I bought recently a e-bike (urban/light offroad, front suspension). The spec sheet indicates that the brakes are Magura MT5 eSTOP. I noticed that the front calipers have 4 pistons, as one should expect from the spec sheet, but the rear calipers have 2 pistons. Judging by the colours of the "piston ornaments" it should be an MT4 eSTOP.
The pictures on the manufacturer website show this configuration, which suggests it's the intention, and not a replacement on my individual bike because of parts availability. The same discrepancy between the spec sheet and the pictures can be seen on other e-bikes from the same manufacturer (a rigid urban bike, and a lightweight hardtail MTB).
Besides the minor cost saving (20€ RRP, but that's for them, not the client) and 15g weight decrease, are there advantages or drawback of using this combination?