At least Fedora and Elementary have distro-made repos. They use them to package their apps for all distro versions without having to rely on Flathub infra and admins

It should. Install it to find out, you can keep both Bazaar and Discover while you make up your mind

So I just checked:

Gnome apps have themed decorations and vanilla content. It’s misaligned and it doesn’t look good, but it’s rather safe functionnality-wise. Also there’s no ~/.config/gtk-4 so I don’t know how they did it

A lot of other apps are clearly themed, but they are not maintained by signatories of the letter (that I know of)

The only offenders I could find are file-roller and gnome-disk, with gnome-disk having a very small theming issue. They use the same config file as all the apps that want to be themed, so they would have to patch them in order to prevent the theme from applying. Which would prevent user theming and generally be a mess.

No, Debian never had a custom preinstalled theme afaik

I’m not aware of any distro who kept their custom themes after this letter was published. ZorinOS still has some theming, but it looks like they only slightly changed some colors (where the previous one was rather invasive)

A blank 10cm by 10cm square piece of aluminium. About 2 cm thick

I think I wanted to know how it felt. Like, the vibe of aluminium

If you already have the correct version of the flatpak installed, you can try flatpak build-bundle.

flatpak build-bundle LOCATION FILENAME NAME where

• LOCATION is the path of the repo on disk. Run flatpak info -l org.kde.arianna, and copy the part before /app
• FILENAME is the output file name, preferably .flatpak. Eg: arianna.flatpak
• NAME is the name of the app, here org.kde.arianna

The generated file can be installed with a double-click, or with flatpak install <file>

This is the equivalent of an Android .apk. It contains the app but depends on a runtime. If you want to install it in a few years, odds are the runtime will no longer be available. You can backup the runtime the same way with the --runtime option.

flatpak build-bundle --runtime LOCATION FILENAME NAME where

• LOCATION same as earlier
• FILENAME eg arianna-runtime.flatpak
• NAME is the name of the runtime, which you can get with flatpak info --show-runtime org.kde.arianna

This takes a while, for some reason. Maybe it’s compressing stuff?

The runtime is installed the same way as the app: double click or flatpak install.

Note: I only did this once, and not specifically on Arianna. Hope it works.