"Linux has, historically, been quite messy when it comes to software distribution. We have various distribution-specific packaging formats like .deb (Debian / Ubuntu), .rpm (Fedora) and the list just goes on and on. Canonical also went their own way with Ubuntu for the likes of Snap, but the real winner is going to end up being Flatpak and the main Flathub store."

Software distribution under Linux is anything but chaotic. On the contrary, it is extremely orderly.Each distribution offers its own software library and package format. This, among other things, increases system security. This makes it much more difficult to implant malware under Linux.

Snap was most certainly developed by Ubuntu to try to provide unique packages for all variants of its distributions, thus avoiding having to recompile packages x times for each of the Ubuntu versions still in use.

Flatpack will never replace .deb, .rpm, or other packages. Furthermore, unverified Flatpacks can pose serious security problems on a system.

Flatpack is used as the primary source of software access on distributions at the stage of development alpha / beta, on distributions that are immutable due to their structural complexity, or on new distributions that do not yet have enough software to offer their users. Flatpack is in no way intended to replace .deb, .rpm or other formats.

To understand Linux, analyze all of this from the perspective of developers and system engineers/architects. As an amateur unfamiliar with Linux, it is impossible to speculate on this subject without making a mistake.

From a down-to-earth point of view, Linux is free and benefits large groups such as IBM, Oracle, Microsoft, Amazon, Google, etc.

It's not Valve and its Steam client that are giving Linux a boost, but rather the other way around. Linux is provided to Valve in a fully functional state. Valve then simply adds its own layer (just like with Android for telephony), allowing them to launch an operating system bearing their name while drastically reducing research and development costs.

Today Linux is much easier to access for inexperienced users, but it should not be forgotten that this is an operating system developed by and for experienced professionals.