The majority of all commuters in SF do not commute by car
A plurality do (35% in 2022 vs 17% via transit). Remote work knocked down the percentage that commute by car a bit, but took a bigger chunk out of the other modes (e.g. 34% used transit in 2018 but 17% in 2022).
I've used a messenger bag for decades and never felt marginalized in the least. Plenty of other folks seem to rock employer swag backpacks. vOv
Sure, it's just ...pretty odd? for OP to say "backpacks were marginalized as being associated with being too poor to own a car" when it's 65% of people who do not use a car in this context at all.
This was 20-25 years ago. No Uber Cab, no Google shuttles, no e-bikes, no rental scooters, Caltrain was diesel and hadn't been renovated, and there was no real-time tracking of Muni buses' positions, so unless you were taking an express bus, you had no idea when the bus would arrive at the stop. And a large part of San Francisco's population was still poor.
There were a lot of people who didn't use a car in that context at all, but people who could mostly did.
I've used a messenger bag for decades and never felt marginalized in the least. Plenty of other folks seem to rock employer swag backpacks. vOv