I'm defining it the same way that Mint and Ubuntu is here. Which is when they release a new version of their ISO. We are currently on 22.04.37. Release date January of 2024. There are substantial changes since the first ISO build of 22.04
It's not stable in the Debian sense. We've always had rolling release updates for the system base; and people often complain about regressions in Linux, Pipewire, Mesa, and NVIDIA updates. I get them packaged shortly after they're released. As long as they pass QA tests in the System76 hardware lab, they get released within a week.
I am still actively maintaining Pop!_OS. COSMIC has not changed that aspect of my job. Just within the last week I packaged Linux 6.6.8, Mesa 23.3.2, Just 1.22, Rust 1.75.0, and updated Popsicle's dependencies to fix a bindgen build error with recent versions of Clang. We have a systemd update that was packaged today, and I'll be doing another linux-firmware backport soon. So I don't understand why you'd think it is stagnant. We're even shipping Pipewire 1.0.0 by default, which Ubuntu hasn't yet done in the latest version. People usually complain that we update too often.
Pop!_OS has released 37 versions based on Ubuntu Jammy, though. Soon to be 38.
There are new versions released every two or three weeks. I'm about to release Linux 6.6.8 with Mesa 23.3.2. We have Pipewire 1.0.0 and NVIDIA 545. ISOs are regularly rebuilt with our latest updates.
2022 was only a year and a half ago, and we ship the latest Linux kernel, firmware, Mesa libraries, NVIDIA drivers and libraries, Pipewire/Wireplumber, ZFS, Firefox, Alacritty, Lutris, Steam, and Rust. Since when did we start considering that to be "incredibly ancient"? The next LTS release is not yet available to base Pop!_OS upon, but we ship newer kernels and drivers than the latest version of Ubuntu.
This is already in progress. COSMIC applications are compatible with Redox OS.
You can start with the libcosmic repository, and the examples contained within. We're going to work on revamping our design demo application soon, which will be a learning resource for COSMIC application development
In my experience, that has never been an issue with any Rust-based projects. It's quite the opposite. 80% of time is spent completing the first 20% of the project, and then the remaining 80% is quickly finished as everything fits into place. Most of our time is spent in foundational work getting widgets created that we can use with our theme system, and then the actual implementation of the interface in the application is stupid easy.
What you describe is what I felt developing the GNOME extensions. There's very little you can do to resolve issues that you encounter there.
COSMIC Edit is being developed by our manager through personal motivation; who also developed cosmic-text, so this is the perfect playground for simultaneously advanced cosmic-text, and developing useful real world software with it. The git diff view was not yet part of planned designs, but it took only a portion of a day to implement. It adds a useful test case for the cosmic-text library, and improved cosmic-text as a result.
We're all paid a full time salary to work on COSMIC and Pop!_OS. Each person on the team is going to spend a full day writing software, regardless of what they're working on, so concerns about burnout are somewhat silly. Burnout is typically caused by working overtime for extended periods of time. System76 has never required developers to work overtime to meet a deadline, and variety of workload can alleviate mental fatigue, so burnout is not a thing here.
You are misunderstanding the data. It is not the number of users, but a percent of posts to ProtonDB, which only applies to PC gamers. There can be a disproportionately larger number of reports from those who need to spend time tweaking their system as opposed to using it, or that are particularly vocal about sharing their tweaks.
The total number of users playing games on Linux is rising each year. Pop!_OS was the first OS that a lot of people tried a few years ago, and so you'll see a lot more diversity in choice now. People who are new to Linux, yet particularly heavily invested in it, tend to like to try out a lot of different distributions in the following years.