Most people don't intend to print tons every year nor desire to manage a print farm. Most people interested in creating object rather than managing printers will have an infinitely better experience getting a Bambu that is ready to crank out amazing prints right out of the box.

Other than basic troubleshooting (which they have documentation on) there isn't really a need to take a deep dive into how exactly each piece works.

I say this as someone who started printing many years ago with an i3 clone and has replaced nearly every piece of multiple printers (control board, bearings, hotend, extruder, etc!) over the years for better performance. I moved away from wanting to tinker with the printers and haven't touched them since getting a P1S years ago.