Comment by gyomu

As always, Apple didn't wholesale invent a product category, but they made the first product that synthesized all the right tradeoffs in a sufficiently compelling package that enabled them to sell tens/hundreds of millions of units fairly quickly[0].

- hardware quality wise, already the 1st gen Apple Pencil had the specs of the higher end tablets (12-bit pressure sensitivity, orientation, azimuth, all in a sleek package)

- you can use your iPad for a bunch of other stuff too, and it's super portable - whereas for the high end tethered drawing tablets, they're pretty single purpose, and they take up a bunch of space on your desk. This all matters to broke artists living in dorm rooms/tiny apartments.

- the Procreate team designed a tool that was really focused on the digital drawing experience and managed to make a high quality, affordable product out of it. The standard for digital drawing on those tethered tablets is mostly Photoshop, which a) is meant for tons of stuff beyond drawing, making it quite complex and b) has 4 decades of interface cruft piled up at this point.

Honestly yeah, there truly are pre/post iPad+Pencil eras in consumer tech for anyone doing work that involves hand illustration/sketching.

[0] whereas their competitors struggle to sell low numbers of units at terrible margins