I'm about to pull the trigger on ordering a Raspberry Pi 400 as a system to do web dev testing, occasional light server duties, maybe some retro gaming from time to time, and running networking labs ...
The Raspberry Pi OS has evolved considerably from being a Debian fork (Raspbian) into a mature operating system, just about staying ahead of competing distros. Unless you have a very specific purpose ...
The firmware included with the Raspberry Pi 2 Model B version 1.2 introduced the possibility of booting from a USB device: before that, it was only possible to boot from an SD or microSD card. But ...