The whole thing with holding back package updates for a some weeks doesn't make a ton of sense to me, especially given that to my understanding security updates are often held back as well. The main advantage over Arch is that it has a graphical installer, but IMO Arch really isn't that hard to install now with archinstall
being a thing.
In another vein, they've let their website certificate expire on multiple occasions, and have shipped pamac versions that have ended up DDoSing the AUR on multiple occasions as well. All this hints at some fairly serious mismanagement and doesn't exactly lend itself to the implicit trust required of distro maintainers.
I did use Manjaro for a decent stretch before eventually switching to Arch, and functionally I didn't notice any difference after switching apart from the AUR manager I used and packages making their way to my system sooner. This is a big part of why I say I don't really see the point.