First to the points to "avoid": This is very vague and perhaps you noted or perhaps not so direct ... we were attacked that often also in the younger past now, that we have left that open and only make the points in talks like these here. It is not to avoid, but with the information provided in the wiki and the forums we want to give insights. It is not about the question: "Who is the best and purest?"
We are not here to make some "gamification" of systems, like a highscore. AppImage is for example just a technology, depending on what the maintainers package within. snap? Has only client-part not more. So emancipation is not possible.
Rust, Java and Go are different and in many parts same: Java has issues with licensing and very dirty to package with licensing. Rust and Go have the issue of questionable dependencies to download for building. So it is up to every user to get to a point: Do I want that? Do I need that? Or am I able to search alternatives? We will never blame anyone for deciding different. But as you perhaps get more and more deeper, you can see that Hyperbola is very small going about that languages and imlementations alone. So coming to Qt6:
I recommend to look if older versions are there supporting Qt5 explicit. Qt6 is questionable also with its approach in licensing. See the major issue is and stays licensing. The newer we go the more questionable it gets. More "open-source"-oriented which is in fact not "free and libre culture". The point overseen mostly by many people and in time also not that often more underlined by organizations like the FSF and FSFE. It is needed nevertheless as every new release is a risk for applications and projects.
If you ask me personal: Rust, Java and Go are no point for packaging and building. AppImage, interesting but depends. snap? Only on Canonical, not a point for Hyperbola. Qt6? Better keeping it out for the moment. Perhaps to rethink when HyperbolaBSD 1.0 stable is out. Hyperbola was and is always about technical emancipation, leaving decisions for users and as underlined - you have asked indirect - we had also applications and packages before 0.4 in our repositories. But this was based on a snapshot taken. When you rebuild all packages and the whole system your own (version 0.4.x) you note how difficult and complex some are for sure. And also how important their handle is or even impossible: Like GO or Rust.
Human being in favor with clear principles and so also for freedom in soft- and hardware!
Certainly anyone who has the power to make you believe absurdities has the power to make you commit injustices: For a life of every being full with peace and kindness, including diversity and freedom. Capitalism is destroying our minds, the planet itself and the universe in the end!