I hear that. I wasn't saying that the AUR is what causes the problems though. The AUR works better in Arch where everything is kept up to date, since that's what the AUR targets. Manjaro holding back packages causes problems because the libraries and other packages might not be as up to date as the AUR scripts expect. This ends up causing more potential issues than the AUR otherwise would. If you're not using the AUR then this all won't have any effect on your usage of Manjaro, of course.