https://wiki.manjaro.org/index.php/Manjaro:A_Different_Kind_of_Beast
Although Manjaro is Arch-based and Arch compatible, it is not Arch.
Manjaro package repository
Stable branch - There is no solid rule indicating when Stable branch is snapped from testing. It can be anything from one to four weeks…
Testing branch - Testing branch is snapped from unstable at irregular intervals - …
Unstable branch - Unstable branch is synced several times daily from Arch stable
Manjaro Unstable is Arch Stable
I think people who dislike flatpaks or similar aren’t having “problems”. They work, but they’re using using a sledgehammer to drive a nail.