I think the storage of filament settings on the printer is part of Bambu’s efforts to promote the Makerworld concept - tap the model in Handy and print without a computer or slicer.
But those calibration settings can be lost with a firmware reset (or powering down?).
I’ve never had a need for the spur of the moment prints that Makerworld promotes.
The computer time to prepare and slice a model is usually small compared to actual print time, so I don’t consider that a disadvantage. Sorting through all the available profiles for a Makerworld print can take nearly as long. Personally, I like the full control I have using a slicer, so I use OrcaSlicer for filament calibration and nearly all my prints. So all my filament calibrations are backed up locally (on two computers which are backed up daily) and in the Bambu cloud.