I don't know if it's actually necessary, but it's the upper end of the recommendations I've seen/heard, and I noticed a surprising improvement in performance after I cleaned/lubed it.
I assume it's also more important on e-bikes (and especially cargo e-bikes) since the chain sees higher forces over longer periods of time.
I assume it's also more important on e-bikes (and especially cargo e-bikes) since the chain sees higher forces over longer periods of time.