Well because of money. You certainly have to pay to get Ubuntu certificated. And you only do this to have a Linux system with support from the manufacturer.

It’s an enterprise problem with an enterprise solution.

The normal personal systems are not in the same segment.

Would suggest raid0 for maximum read speed /s

There are plenty of options, I will have to look up which are currently the best.

But I would recommend starting out with a normal “cube” like design. Delta printers seem cool but are not really beginner friendly.

To further ease the search I would look for a direct drive extruder. It’s easier to calibrate and you don’t have the hassle with potential problems regarding the Bowden tube.

Creality and Anycube are the goto brands for big community support, as far as I know.