PCs have large displays, keyboards, mice, and wired network connections. They often have CD or DVD drives. Tablets, in contrast, have small displays, virtual keyboards, a touch screen (so no mice), no wired network connection, and media storage (if any) is limited to memory cards.
So we can view the transition from PC to tablet as a shift in peripherals. The "old school" PC used physical keyboards, mice, and disks; the "new school" tablets use touch screens, virtual keyboards, and no mice tor disks.
Except for one small detail.
Tablet users are using keyboards.
I do understand that some people are using tablets with mice and printers. A small minority of people, but nowhere near the sizable number of people are using physical keyboards.
The appeal of keyboards is such that people continue to use them as an input device. They carry a keyboard with their tablet. They buy tablet covers that have built-in keyboards.
I think this tells us something about keyboards.