Having been born 9 years after 1984, I look at this and think how little desktop operating system GUI's have changed in 32 years. The same menus, windows, icons are all still very familiar, albeit with more visual 'eye candy' nowadays.
Functionality-wise it seems both Windows and Mac are stuck somewhere in the 90s.
You have a early "runway" phase where you get the basics hammered out, then you get a near vertical phase as those basics get rapidly refined. Then it plateaus as those the ROI on those refinements worsen.
Between the 60s and now we have had multiples of these "S" curves happen back to back. And now most, or all, are plateauing.
But there are big changes you can't see here. The biggest that the original Mac didn't have was networking. Ubiquitous networking has radically changed computing.