No I don't think anyone will argue with you over the vid from Banks. In fact he has at least 3 vids on the subject, the one you post, this one regarding a stock design.I know some folks will fight with me posting this here, for some of those interested in the tech, Gale Banks is doing a video serious on diff covers.
And this one regarding a flat back design.
With each seeking to answer what happens to the fluid at speed.
So the answer to the OP's question appears to be no, all designs are not equal. Go for protection in as near an OEM design as possible or an external skelton. IMO.