This shit is all cyclical.
4 years ago EVERYYYONE ran a push/pull/legs program. Right now, upper/lower is it.
Honestly, i gotta give JP probably the MOST credit for the popularity of non-bro split training within the BBing community.
10-15 years ago, no one was doing this shit. Frequency was not a thing yet. It was "beat the fuck out of chest" then "rest it for 7 days."
That's it.
Personally, the larger the grouping of muscles, the longer my workout is going to be. It probably comes down to specialization and how advanced someones training age is. Someone just trying to get huge, i can program bent over rows, pulldowns, maybe some SA DB rows and they'd be ok. But for someone more advanced it might take more than that and then become a 2+ hr workout. Jordan's original message was grow as big as you can on upper/lower, then PPL until you have some obvious weakparts (this should be when someone is already massive and fine tuning their physique) THENNN switch to the bro split to bring said bodyparts up.