First of all, the settings: you can boot up a Manjaro machine and copy the .config/sway/config and whatever other files it might be referencing (another config in /etc maybe?). Then it is just a matter of installing the dependencies like the referenced themes and tools(= any programs listed for shortcuts) in there and you should be able to get the same setup, unless Manajro people set GTK themes outside of sway or sth... Feel free to comment once you hit that wall :)

As to why Manjaro is widely criticized: they delay all updates by some time for a false sense of stability (I think two weeks) which is often considered to make no sense since it delays bugs, but also their fixes. Then there is some general philosophical disagreement between them and the Arch community since Manajro breaks Arch's DIY and learning principles by being ready to use out of the box. This is mainly because they include all kinds of stuff which also makes the distro considered bloated. In the end, one big advice to give right from the start: searching for help in Arch forums as a Manjaro user is rarely tolerated, if you run Arco, your problem will likely be accepted though.

Hope it helps!