I guess that my Epiphone Explorer was an exception to the rule then.
I know from experience that an Explorer guitar, I own a very funky Vox explorer copy fitted with Jazzmaster pickups, is indeed a very comfortable and good balanced instrument but as a bass with the longer neck (and as was the thing with my Epiphone) the heavier tuners it makes it very unbalanced.
On the other hand, the exploiter was first made as a custom Boris the spider bass for John Entwistle right? Prior to playing Alembics he played Gibson Thunderbirds and custom basses with Fender necks and Thunderbird and explorer shaped bodies. Even the current Warwick and Status Buzzard models still have that offset shape that Entwistle liked in the Gibsons he used to play and I guess with him strapping the bass up high, he pushes the bass down with his elbow keeping it well balanced.
At least, that's what I think.