The real dependency problem is that when an AUR package updates and Manjaro’s packages are not new enough for the update, it will cause breakage.
How many AUR packages do you use? I have about 70 installed right now. Never had a source-level incompatibility happen. You'd have to let system updates lapse for years to lose source compatibility with a current AUR package.
I no longer use Arch, but this wouldn't have happened to me because I used vanilla Arch. On Manjaro it can happen at any moment that an AUR package silently depends on a new part of a dependency not implemented in the older versions. The AUR does not care to figure out which exact version dependencies are needed for a program, because you are expected to always have an up-to-date Arch system before installing. If the AUR cared about Manjaro compatibility they would need to mark every dependency with a minimum version number, but that's a lot of effort and the AUR understandably doesn't care about supporting Manjaro's repos. If Manjaro stood up its own AUR this would no longer be a problem.
(Personally, I don't think AUR packages are a good idea for system stability/security even on vanilla Arch, but it is understandable that people like them for their convenience.)
How many AUR packages do you use? I have about 70 installed right now. Never had a source-level incompatibility happen. You'd have to let system updates lapse for years to lose source compatibility with a current AUR package.
I no longer use Arch, but this wouldn't have happened to me because I used vanilla Arch. On Manjaro it can happen at any moment that an AUR package silently depends on a new part of a dependency not implemented in the older versions. The AUR does not care to figure out which exact version dependencies are needed for a program, because you are expected to always have an up-to-date Arch system before installing. If the AUR cared about Manjaro compatibility they would need to mark every dependency with a minimum version number, but that's a lot of effort and the AUR understandably doesn't care about supporting Manjaro's repos. If Manjaro stood up its own AUR this would no longer be a problem.
(Personally, I don't think AUR packages are a good idea for system stability/security even on vanilla Arch, but it is understandable that people like them for their convenience.)