Fair enough. And today I'm sure studios sweat that small stuff, much like they sweat over which $10K mic they will use for vocals on this track, because that decision will certainly make or break the sing (sarcasm alert).
But back then, come on! It just didn't happen! Jamerson's action was notoriously high. There is no way physically possible that his intonation was even close to "studio spec" by today's (creepy and weird) standards. It defies the laws of physics! That's why I am constantly giving my studio owner friends all kinds of crap about what they worry about. I go to record for them and they will get into arguments over whether to use the LA 2A or the old Gates compressor for my tracks. Seriously????? Do you honestly think anyone listening to that track later is going to say "Dang, those idiots should have gone with the Gates."???????? (Answer: No, they won't ever do that..... like...... ever.) But they will get into long debates over it. It's OCD to the point of insanity. And for NO GAIN IN QUALITY WHATSOEVER when out in the context of the whole mix.
Read up on intonation. True intonation is impossible on regular guitars and basses. "Studio spec" is a myth. Sorry. It can't exist. It is, at best, a compromise of what you are willing to put up with. But mostly it's a bunch of guys who worry too much and read too many articles on the interwebs.
Meh. It's just my opinion. I'm not as worked up over it as my writing would imply. I don't see bold text as "cyber yelling".