Linux

From an advertising perspective, it's important to think about who you're targeting. Who are your likely customers? Certainly there are some based on the strengths that you raised.

However, some people are definitely not a good target audience, and some people is actually a very large group of people. There are a lot of current and potential users who essentially want the standard major applications to work, and they're not going to touch the root partition, and they want things to be very simple. For people like that, Debian or Ubuntu or Fedora already do what they want. And these major operating systems have been around for so long that people will naturally be more confident using them, because they were their friends have experience, or because they think the organization has more stability because of its experience.

Of course a lot of things depend on how you define words, but to me the above paragraph describes the mainstream audience, and I don't think you're going to have much luck reaching them, because I don't think the thing you're trying to sell gives them extra value. In other words, it's not solving a problem for them, so why should they care.

Could you share some pics (without anything private ofc) of bazzite? I wanted to try it but I couldn't use it as live distro. My main problem is arch because I'm used to apt and I find pacman or whatever it uses difficult for me (nothing I can't learn ofc)

I love the idea of getting a fresh image for every update

What do you mean? Thanks

I need to run immutable distros more, and I need to figure out how to roll my own images.

Desktop side, I need certain things in the base image rather than adding more layers or using a container. Things like rsync, nvim, git, curl, lynx, etc.

Would immutable distros help reach more desktop audiences? Perhaps. It’s more about applications though. The biggest help has been electron apps and the migration to web apps. The Steam Deck is successful because it has applications people want.

Server side, they look really promising for bare metal servers. Provided, there is an easy way to compile custom images. Being able to easily rollback to a known good image is very enticing, as you point out.