Thanks for the long reply :)
Yeah, I knew that without having tested it I was risking all of the usual perils of analysis in a vacuum - I only made the comment because the Goliath seemed to be getting it both ways, less damage AND more fragile, and it didn't feel that the mobility or utility upgrade would compensate enough... but I've seen enough cases where actual play makes the read-through white room analysis basically useless to happily accept that you tested it and no it's fine really. Thanks for placating my uncorroborated doomsaying, then!