Well the JP4 can't spot for itself and can't see in any direction except forward, but it still has 60 range. The M10 and M36 can't spot for themselves either.
Well, the JP4 isnt doctrinal 13 CP, doesnt cost 800mp 290 fuel on a fuel starved faction, it may be spammable and it can come very early. (Are you really trying to compare a super heavy with a medium XD?)