While this is true, and I learned a ton on my Creality. Some people don’t want to tinker, or repair anything. Some folks aren’t comfortable or confident in their ability to do that. That is why you can find so many super cheap used creality printers. People buy them, and don’t want to work on them. It fails and they get rid of it. If you get a more reliable machine, like the Prusa, and it seems like Bambulabs is starting to join that club then you may never really need to repair it.
I have had my prusa for coming up on 2 years and haven’t adjusted or touched anything. I did build it as a kit, and have built and tinkered with Enders, but with my prusa I don’t need to. If people don’t plan on printfarming or selling, or having it run 24/7 chances are it will run for ages without needing to adjust anything. Thats not the case with the cheap printers.