I used to as well and it always caused issues. AUR packages are not designed to be used with Manjaro packages, stuff can break and updates get funky. That's why Manjaro disables it by default.
It's kind of like I have gmail and you have protonmail but we can still send emails to each other. Conversely emails from "@nigerianprince.com" will probably get spam filtered or blocked and you may not be able to communicate with them.
I ran Manjaro for a year or so. It works well and the default theming looks great but I don't really see a point to the distro really. It's basically just Arch from a couple weeks ago with no AUR support.
@DayDuJour
@kbin.social