Manjaro is a great distro, but is starting to get it's reputation affected(for better or worse) by decisions to include certain certain packages or similar choices by default.
I think it's great that Manjaro does this with the goal of giving the users software out of the box with installs so they can just "get ■■■■ done", be that common activities like gaming on Steam or working with some MS office docs from a colleague that they collaborate with.
However, not everyone wants this, and it's starting to become a bit of a concern as this amount of additions increase. Some may draw negative opinions when there are integrations with MS services(360), or proprietary office software that seems it may be potentially sponsored to be included(regardless of if it's a great choice for office software on Linux). Meanwhile they may not have anything against proprietary nvidia drivers or the inclusion of Steam, others might?
Could Manjaro be open to the idea of opt-out section in the installer? That way you can still serve your user base best with a nice set of defaults and not negatively impact another part of the user base that has clearly caused a bit of drama recently with certain decisions. I assume Calamares is capable of such a feature like other installers have?
I think it would go down better than "You can just uninstall what you don't want afterwards". Is it a big ask for an improvement like that? It provides a bit more transparency and signal that you care about users concerns such as that from the get-go.
I suggest opt-out, rather than opt-in as I think these choices are still great for most, especially users newer to Linux which this distro can attract. It's better that they have an easy install process and don't have to deal with analysis paralysis when it comes to finding a package for working with office documents when they rather save time and just have something that works well with little trouble. While at the same time, the more advanced users that have bias/preferences can opt-out if they don't have interest in the packages at all or prefer alternatives(eg Discover instead of fpakman).
Once again, not complaining or against what the maintainers of the distro are choosing to do here. Just wanting to avoid Manjaro becoming something that repels a group of users that are fond of it, and doesn't lead to bad word of mouth. Ubuntu's Amazon search feature for example was quite a bit of negative press, even though a user could opt-out of the default and disable it after an install.