When I say maintenance with respect to Arch Linux, I mean ensuring that all pieces of your system which you personally chose continue to function together without issue e.g., configuring display drivers (especially relevant with dual intel/nvidia), PulseAudio/Pipewire, laptop power management, and generally dealing with applications that do not officially support Arch Linux if they break. Manjaro (if I recall correctly) removes the task of putting the system together yourself, but it will still require more knowledge to maintain and troubleshoot than most Ubuntu derivatives. This doesn't mean that it's a bad choice, or even necessarily that it's a bad choice for new users, but if switching you should nevertheless keep it in mind.