“The divide between the progress of the Internet and the progress of the word processor could not be more stark. The word processor launches to something that looks barely any different today than it looked decades ago.”

Do you remember the days of WordStar, when a mouse was just a rather timid rodent that inadvertently antagonised cats and fantasised about processed cheese? If you're too young to know what I’m rambling on about, WordStar was the premier word processor of the 1980s, and it primarily existed on computers with non-graphical operating systems.
For the majority of PC users there was no mouse. Every instruction to a PC program had to come via the keyboard. And because the era's foremost operating system - DOS - had no graphical capability, the word processor couldn't represent elements of formatting as literal variations on screen. For a given display resolution, text would always reproduce at the same size, and with the same CP437 styling. It couldn't be italicised on screen, or displayed in bold. And many PCs of the 1980s only had monochromatic monitors, so even colour-coding was off the agenda as a universal means to represent format changes.
Whilst one might imagine that word processing software would be roundly unpopular under such unconducive conditions, offices couldn't get their hands on WordStar fast enough, and sales went through the roof. The software's renowned mail merge capability linked it up with the database behemoth dBASE, and suddenly, SMEs could produce their own mailshots, run off personalised invitations, autoprint customer/client/patient reminder letters... The future had arrived.