The sound on MacBooks is impressively loud and clear, but it's also not actually good sound. Because it couldn't be, in that form factor. So for things where you actually care about good sound (i.e., music, movies, TV), you probably still want headphones or speakers anyway.
I have a stereo system with a DSP which I've spent quite a bit of time adjusting with tools like REW. I do care. I'm obviously adjusting my expectations because the laptop is indeed small but it really does sound great and I prefer it to typically boomy resonating bass-heavy tuning of small speakers. It's also very good at stereo separation, can even do behind-the-listener flyby from a Dolby Atmos test file.
> I’ll wager you have not listened to high-quality music or movies on a recent MacBook Pro.
Because of this conversation, I just watched Ne Zha (the first one, from 2019) on my M1-generation MacBook Pro. It sounded okay. I didn't hate it like I'd hate listening on a tablet or something. But...
> I’ve never heard a BT speaker of any size sound that good.
My MacBook Pro didn't sound as good as the smallest bluetooth speaker that I personally own and use (Marshall Kilburn), which is battery powered and whose primary daily use in my life is playing podcasts while I shower. It definitely didn't sound as good as the budget brand PC speakers I use with my TV (Edifier 1700BTs), either-- with or without a subwoofer. It didn't even sound as good as my wireless earbuds, let alone my headphones.
I don't think my tastes are that fancy. I've never had a surround sound setup. I've never tried a pair of IEMs. I've never owned or pursued a "audiophile"-grade equipment. I'm not a basshead, either.
I can appreciate some of the nice qualities of my MacBook's speakers relative to the form factor. But at the end of the day it still clearly falls in the "not real speakers" bucket. They're laptop speakers, not magic.