Several thoughts:
MOST all of the major manufacturers make electric basses in similar shapes to their guitars. There are a number who have 'standalone' bass designs (Ibanez comes to mind among them), but they are a minority.
Not a lot of manufacturers are as successful in electric guitars equal to their electric bass business.
And a lot of this is now made even more murky in this era of online sales, and internet access to small builders who would have been minor, regional players back in the old days.
Gibson (and it has to be era corrected over the years due to the various owners over that time; they've now had three or four owners in my lifetime) rightly thought to get into the electric bass business as an adjunct to their guitar business. And they made questionable decisions in their electric guitars as well: They really thought SG's would replace Les Pauls for the bulk of the 1960's.
The original EB, the 335-style EB's, and to me as well the SG-shaped EB's were 'of their time'; scale lengths kept changing, the 'mudbucker' pickup certainly delivered that flatwound thump tone in spades, and electric bass was still a new instrument in the 50's into the 60's, and importantly, completely different choices vs. Fender-style basses. Gibson took a lot of pride in that theirs weren't some screw-together bass, but properly built instruments. And they're hardly alone in their bass shapes echoing familiar guitar shapes.
The Thunderbirds were the first real adoption of a real two-pickup, solid body, 34" scale that was a success. And the only of those three 'designer' shapes that worked in a practical sense: Alembic once built Entwistle a full 34"-scale Flying V-shaped axe, and it was almost as tall as an upright, and an Explorer shape could be just as long. T-Birds expectedly suffered from that long-scale with a big peghead and four Schallers trying to home in on Mother Earth with that short upper shoulder.
The Ripper (concurrently with the similar Grabber and G3) was to me the closest they came to a Gen-U-Wine original bass design that worked in a Fender world and was a viable alternative, between the body/neck design and Bill Lawrence's pickup/tone network design. With that reissue from several years back, I'd have kept those electronics and added Ultralights and the HipShot Gibson replacement bridge and left well enough alone. That axe would have easily grown to five-string no problem.
Which brings me to the point (…...finally...…), that Gibson has some worthy axes, but a reissued updated Ripper and a rationalized Victory bass (update to Barts, slim the body depth to save weight, and cleverly reduce the peghead a little and fit UltraLites) would have been far better in terms of genuinely competing in the real bass world; for me, their assortment of the SG/EB's, crash-diving T-Birds, the 'THAT's a Gibson' recent bolt-on EB's, and other oddballs to me guarantees that they'll keep mining a narrow market instead of having a lineup that could still be obviously Gibson and compete head-to-head with anyone out there.
But then, that's one curmudgeon's opinion, surely different than others.