Linux

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The difference with Fedora Atomic, which I think you refer to, is that it's totally open. For example, people started using the OCI containers differently than Fedora intended, which resulted in uBlue and stuff like Bazzite.

Also, no one forces you to use Flatpak. You can still use Distrobox and use Pacman/ APT/ DNF/ whatever you prefer and export your apps that way. It's just that Flatpak "won" and doesn't have many drawbacks, and is very convenient. I mostly like them.

And, most importantly, Fedora is the fronteer of innovation.
There were many projects and ideas that failed, but many more succedded (Wayland, image based distros, etc.), and Project Atomic is just one more "testing ground" that is well thought out imo. Therefore people are expecting to "test out" new generation Linux stuff, it's just part of Fedora. If you don't like that, use Debian instead.

I can recommend you to give Fedora Atomic a chance, it's an extremely nice family of distros (e.g. Bluefin/ Aurora, Bazzite, etc.)!

Edit: one more thing is that Fedora is, in contrast to Ubuntu, not controlled by a company. RedHat doesn't have nearly as much influence as people think, it's mainly community driven, and therefore choices aren't (in theory) influenced by $$$

It is absolutely a different situation if it is opt-in. If Ubuntu made Snaps opt-in, people might not like them but it'd be a minor critique instead of fleeing the distro.

Well there is immutable, which you probably refer to with Fedoras new distro, and then there is Canonical pushing their shitty snap format, and kinda non-sideloading. Can't wait for the day when apt only ever allows to install snap packages.

Fedora Silverblue is in an entirely different ball game. You can't use dnf because it's an immutable image based system where you can't make direct changes to the Root system without making use of the rpm-ostree & VCS mechanisms. You're making a conscious choice by using Fedora Silverblue, and the pros out way the cons for most people making that choice.
In contrast Fedora Workstation allows you to use dnf just as normal because it's not an immutable image based system.
Ubuntu doesn't make use of any such system so their reliance on containerized user-space apps isn't a technical one.

People love using flatpaks instead (yes I know of all the shortcomings, but you can always choose another install method for that broken package).

Not on Ubuntu nor Fedora, but yes: If a "larger" package breaks on update and there is no fix available and I use that application on a pretty much daily basis, then I remove it and install the Flatpak variant.

Flatpaks are slower, do not work super well with Wayland (especially scaling, some applications have GIANT text, some have 5 pixels large text, but fortunately I was able to circumvent those issues for most applications I use via Flatpak), and you need to run another system for updates and updates are friggin slow.

flatpak-update () { 
    LATEST_NVIDIA=$(flatpak list | grep "GL.nvidia" | cut -f2 | cut -d '.' -f5)
    flatpak update
    flatpak remove --unused --delete-data
    flatpak list | grep org.freedesktop.Platform.GL32.nvidia- | cut -f2 | grep -v "$LATEST_NVIDIA" | xargs -o flatpak uninstall
    flatpak repair
    flatpak update
}

On the other hand, the applications provided via Flatpak just work.

And messing with 32 bits multilib dependency hell for Steam or installing pretty much half of Kde just for Kdenlive simply isn't something I want.

Right. I just installed OpenSUSE MicroOS to try out, and it's the same idea. I agree with some of the anti-snap rhetoric. Closed, Canonical-centric system for profit; linking placeholder debs to download a snap. But the philosophy of all user applications come as chunky but robust packages that (almost) don't interfere with each other and the system - I think that might be the future for safer computing for non-technical users.