Where is this coming from? You absolutely need to know the ins and outs of a 3D printer. Nozzles wear out, build plates wear out, components need to be regularly cleaned properly and lubricated, you have to keep filaments dry, certain filaments can only be used with certain components, you constantly tweak slicer and temperature settings, ... The list goes on.
3D printers, including Bambu Lab printers, are definitely not easy to use nor are they reliable. They're maintenance heavy. Sometimes you have to do a print multiple times because it'll fail for a myriad of reasons. Maybe you oriented it wrong, maybe your slicer settings are off, maybe it didn't have proper supports, maybe the filament is messed up, ...