Whether or not it is wrong to have e-bikes in a group ride is a difficult question to answer.
I'd expect that most ebike riders will lack group ride skills. Hence, eBikes=serious HAZARD.
And assumed to be a HAZARD.
Acquiring the speed, power and skills to ride with the big dogs is part of the "rite of passage".
Just having an ebike that can "hang" ain't enough... I've already made that decision re atlbike rides.