AR is the same thing, it takes the dopamine hit and puts it on your face. Subsequently you get a lot more dopamine hits.
I think you're correct that the smartphone was a phenomenon because it put the internet in your pocket, but we already knew the use case for the internet. People use their smartphones to do everything computers do, and sometimes more: browse the web, read books, find restaurants, make reservations, get directions, use social media platforms, pay for purchases with NFC, listen to music and podcasts, manage their calendars, control their home entertainment systems, check the weather, (...deep breath)
Anyway: "Great dopamine hits, man" falls, I think, into the "necessary but not sufficient" bucket. AR needs to do that, but it needs to do more, too. I agree with "the smartphone was a phenomenon because it put the internet in your pocket," but I think we're still looking for the correct X and Y values of "AR will be a phenomenon because it puts [X] in your [Y]."
for me, being in tech my whole life and growing up solidly a nerd and in the cyberpunk culture of the 80s, when the iphone hit, it was more of a sigh of relief of "ok finally we are making the steps into the cyberpunk future weve been fantasizing and thus building for decades"
it wasnt until the snowden stuff hit and all the current tech problems we have that the sentiment is "oh crap, the dystopian cyberpunk future is a heck of a lot more of a slippry slope than we were ready to deal with as a society"