Sure. When it comes to updates, Manjaro is pretty much doing what every single other distro is doing. Updates that are buggy don't get pushed to the stable branch until they're fixed up, and security updates tend to get pushed through faster than feature updates. The time period that updates get held up by is not a fixed duration, it depends on the specific package and update and can be anywhere between a few days and a few weeks.

As a concrete example, with some major Plasma updates Manjaro has waited for three or even four point releases (4 / 8 weeks) before considering it stable enough vs the newest point release of the previous major release, and following point releases after that get pushed to stable much faster.

As another point, even Arch has a very similar process... Their policy on pushing updates is far more geared towards pushing updates quickly than towards not breaking things, but otherwise it's pretty much the same.

Idk about a source on this stuff though. There's stuff like https://wiki.manjaro.org/index.php/Switching_Branches but I don't know anything better.

Manjaro packages start their lives in the unstable branch. Once they are a deemed stable, they are moved to the testing branch, where more tests will be realized to ensure the package is ready to be submitted to the stable branch