“Countless” mistakes meaning two which were easily fixed.
There’s nothing wrong with Manjaro, in fact it’s probably the most user-friendly Arch distro. I’ve been using it for years and I chose it after trying several various distros and this was the one where everything worked out of the box: graphics, audio, peripherals (including controllers and exotic mice), and of course Steam and gaming.
They package drivers and stable kernels out of the box. They provide an easy to use tool for switching and installing drivers and kernels. They attempt to add extra stability to the distro (not all of us like or need to stay on the very bleeding edge all the time). Delaying the packages has zero relevance for AUR and anybody who believes otherwise should probably stop using AUR because it’s obvious they don’t understand how it works.
People who keep on linking those outdated hate lists about it are actively doing themselves and everybody else a disservice. Promoting hate against an Arch derivative for no good reason will not help Arch’s cause, on the contrary, it makes newcomers to shy away from the whole can of worms and drives them to Ubuntu.