In about 1970, RCA began pressing records with a method called Dynaflex.
There were naysayers at the time. There were complaints about lack of bass tone. Most of those I've seen reference Bowie's Ziggy Stardust album from 1972. Not a good source for argument, as it's recorded that way. I offer in rebuttal to the bass tone argument Jump Into the Fire on Harry Nilsson's Nilsson Schmilsson release. It shakes the wall when cranked up.