They might just for the better display and the better speakers. Light users without an in-depth technical background, understand a better display and better speakers, but are at a loss when you talk about RAM, memory bandwidth, Clock speed, etc
True. I really don't think the segment of "I have light needs, but I'll upgrade to a MacBook Pro for the better display and speakers" is especially large, though.
It's certainly not something Apple highlights too much. For example,
https://www.apple.com/mac/ says:
Air: "Strikingly thin and fast so you can work, play, or create anywhere."
Pro: "The most advanced Mac laptops for demanding workflows."
Sure, underneath that, it points out the display, but it doesn't even mention the speaker difference at all.
If you then go to 'Pro', the four highlights are, in this order:
"The most advanced chips ever built for a personal computer."
"Up to 22 hours of battery life for the ultimate in pro portability."
"The world’s best laptop display. Brilliant in every way."
"A pro laptop without equal. Now in a new color: Space Black."
So I would argue they aren't really emphasizing it that much. (Especially the speakers.) If they were to go to an Apple Store, it sounds like the salesperson
wouldn't use "you should get the Pro; it has better display and speakers" as an argument.
And I say this as someone who has the M1 Pro 14-inch. Its display and speakers are indeed fantastic!