One of the main reasons I run an Arch based distro is because it runs especially well on my older hardware that is very slow by today's standards and has space limitations.
If snaps/flatpaks/appimages are not actually installed on the base versions of Manjaro I don't have any major objections to having it ready to be used if you want to install it. I still wouldn't use them, but having the required components for them to run is neither here nor there (if not coming with preinstalled containerized apps).
Actually coming with these types of apps preinstalled is where it crosses my boundaries of acceptable usage. That is just unacceptable for old hardware that is slow and has space limitations.
If the devs want to go down this road I still have no objections as long as there are differing ISO versions. This would require extra work on the Manjaro teams part, but it makes far more sense to me. Especially with the influx of EOL Windows 7 users that can be expected very soon. All these ex Windows users will be looking for an OS that will run well on their old hardware.
This is a large segment of the people who use Linux. It is the only alternative for re-purposing old inadequate hardware. Don't destroy the main reason many use Manjaro in the first place by adding all these unnecessary components to all the main editions.
If you want a new super max edition for all the new hardware/commercial vendors that's fine, but produce a standard ISO for old hardware without all this extra stuff.
Please don't say that's what Architect is for. The hordes of dispossessed Win 7 users flocking to Manjaro are never going to be capable of using Architect.
Split the editions and I don't think you will hear any complaints, because then you are leaving the choice to the user if they want all the bells and whistles and everything but the kitchen sink. Otherwise I think this is a poor decision.