Most people start on Fender-esque basses and to them, The Oil Rig offers a very counter-intuitive experience. The lack of ability to adjust the height of the individual string is a big deal to many, along with the silk portion of the string often extending over the saddle. There have been reports of the posts pulling out of the body as well, although I've never experienced that myself.
Now, imagine that you were a bass player in the pre-Internet era and had no one to guide you on how to adjust the 3-pointer. You probably wouldn't have been a happy camper. Additionally, imagine thousands of people having that experience and voicing their grief to anyone willing to listen, which inevitably got all the imperfect aspects of the bridge in question magnified to intergalactic proportions over the next 40 years so nowadays most people believe that it's just a crap design.
I learned to live with The Oil Rig back in the late '80s on my RD Standard long before replacements became available, and was able to set it up to play beautifully after some initial head scratching. Having said that, any bass with with a 3-pointer that would enter my house nowadays would get a Hipshot swapped in within a week, no questions asked.
Gibson never cared much about the bass players, and the folks that run the show nowadays care even less than usual. IMO, that is.
My $0.02 only...