The sheer quantity of shots changes everything. Back in the day of film, a pro could burn a roll of film for a single usable shot (maybe). An amateur had development and printing combined (expensive) and had to make every shot count, leading to most shots being of a staged and unnatural variety.
For B&W, it actually wasn't quite that bad with 35mm relative to today. For something like a football game, I might have shot 5 rolls (so 200 frames or so). Random assignments for a given day a roll or two. You made contact prints and printed up what was needed.
Definitely a bigger consideration than today but it's not all about quantity.
Of course, go back pre-35mm and that was even more the case but--as you say--even just a phone takes precent decent pictures for at least certain types of shots if you even halfway know what you're doing. I have tons of equipment and even I just default to my iPhone a lot of the time for casual "memory" type shots.