If your response to Flatpak applications regularly requiring arcane, obscure terminal commands to make them usable is "it's just a terminal command, way less bad than systemd so who cares", you're basically admitting Flatpak was never designed for users to begin with.
@thomholwerda I agree. To really be usable, Flatpak needs to be designed as if the terminal doesn't exist, like iOS and Android.
@thomholwerda Regarding the issue that drew your ire, did you consider filing a feature request in GNOME Software (and/or in "Warehouse") for a GUI to manage language locales for translations + dictionaries + spellchecking, for Flatpak? Looking at the issues tracker, I think nobody bothered to report it.
I think GNOME Software would benefit from such a GUI component even for non-Flatpak packages, too, as non-Debian distros don't have one.
I'm hoping @allanday & @tbernard may be interested.
@matt

@thomholwerda @tbernard @matt @allanday
For what it's worth, I have now filed a feature suggestion in the "Warehouse" #flatpak management app regarding the ability to manage extra languages for spellchecking & dictionaries, for those who use Warehouse as their primary tool: https://github.com/flattool/warehouse/issues/120

I still think it would make sense to also have this in #GNOMESoftware and #KDEDiscover for the majority of people who use those.

Feature Request: Consider offering a GUI for enabling / managing extra language locales (for dictionaries, spellchecking, etc.) · Issue #120 · flattool/warehouse

My proposal does not exist in the PLANNED & NOT PLANNED.md document I have not found any other opened issues on the same feature request I believe this fits within Warehouse's scope of Flatpak mana...

GitHub

@nekohayo @tbernard @matt @allanday It should be part of GNOME's settings application. A panel dedicated to spell checking, where you can select which languages you need, and ticking them will install the correct dictionaries both for regular and Flatpak apps, and ensure they also work in special apps like Firefox and LO. Such a panel not existing is wild to me, considering just how many people use multiple languages every day.

Same applies to KDE, by the way!

I honestly have no idea where I would even make such a feature suggestion, since it covers so many different areas.

@thomholwerda @matt @allanday
I noticed now that @tbernard had mentioned "Language Packs" in https://gitlab.gnome.org/Teams/Design/software-mockups/-/issues/8 as something that should probably go into GNOME Control Center; realistically though, I don't know how feasible this would be, given how much of a scary behemoth the Control Center codebase is. Many people have burned out on it over the years…
The great split (#8) · Issues · Teams / Design / software-mockups · GitLab

We've discussed at various points to split out Software's various component parts into other places, and make it a straightforward Flatpak-only app store. See e.g.

GitLab
@nekohayo @matt @allanday @tbernard It definitely feels like the logical place for it though. Can't back this up with any studies, of course, but I'm pretty sure that if you were to ask any regular user to install an additional spell check language, they'd open KDE's/GNOME's settings app first.