I had problems with manjaro in regards to package updates and kernel management. As I understood, manjaro uses pacman in a weird way by wrapping it with pamac. Pamac was unable, at least for me, to update/install a single specific package without updating the whole system first. This made daily usage a living hell, because packages that are built from source can make a "htop" installation last 30 mins. On the other hand, yay is by far the best package manager I've ever used.
EDIT: Also, supposedly, Manjaro team has some management issues.
EDIT: Also, supposedly, Manjaro team has some management issues.