Given they’ve sold way more than they expected, so I am confused by your criticism.
Also note that the original use case was close to “The BBC micro for schools helped a generation learn software and hardware, but modern computers are rubbish at enabling that, because the software is not designed for kids and the hardware is expensive - nobody wants to risk kids bricking an expensive computer.”
"The Raspberry Pi 400 Personal Computer Kit is the “Christmas morning” product, with the best possible out-of-box experience: a complete PC which plugs into your TV or monitor. The kit comprises:
You are almost certainly going to buy a kit when you first start, and that kit is going to come with a preinstalled SD card, a well known power adapter and often times a basic mouse and keyboard.
(I ended up on this page: https://www.raspberrypi.org/products/raspberry-pi-400-unit/?..., which didn’t list the SD card).