Gaming

I don't use it as a desktop replacement (I still have a windows desktop). But I do but default have my deck docked and hooked up to a TV, in desktop mode.

I've installed various flatpack programs, to include discord, chrome, and a couple jetbrains ides for various languages. They work great. I've done a couple non steam games (diablo), with mild annoyance but success in the end.

I have not used any office programs on it (as much as it's cool to like Linux, I just think Microsoft wins by a lot there, and have no desire to get them working on Linux).

The deck itself has some power limitations, but I have no reason to think that they would translate to steam os on a more powerful machine.

So basically, it probably depends on what you want. It's pretty reasonable. Definitely good enough for my secondary computer that blocks ads for videos on my tv. But personally, I still want a windows computer, because windows is the default assumption for most software I use.

SteamOS core system is locked as read-only. That is what immutable means. In example you cannot install applications using the core system management named "pacman" (short for package manager). There is a toggle in SteamOS to disable this read-only functionality, but with next system update all changes are reverted.

But how do you install applications on SteamOS? You certainly can do, right? Yes! That's the store it offers, which uses a different concept called Flatpak. These are programs you can install without touching the core system. And therefore these are persistent, even on system updates. And they are similar to Android programs in a sandbox.

I assume you are not familiar with how Linux systems operate. Imagine this like Android, where you are only allowed to install from a store, which cannot make changes to the Android core, but only install applications on a secured way. But that is limited. Or imagine a game console where you can only install games and programs which the store has. And it lacks Command Line Interface programs in example or many other tools not found in the official store. That's how SteamOS works at the moment.

And here comes the Nix packagement into play. This is a different system again. You can think of it like Flatpak, meaning any changes to it would be sandboxed and do not touch the core system. This allows for Command Line tools and some other stuff, as discussed before. Nix packages will be part of the next big update of SteamOS.

That's true, but some system level changes by default can't be done because most system folders are read only. It's trivial to turn this off, however a steam os update would overwrite any changes made.

For installing new apps this is not an issue because Steam os is designed with flatpak support, so if an app is shipped as flatpak (or appimage which is just a single file you can execute) then it can be used without making the system folders writeable

However in this case, it's about the nix package manager which needs access to specific system folders to not just install packages (which can be apps or system stuff) but also to apply changes to the system configuration

It's really nice that a valve developer is taking the extra steps to make sure nix can be used out of the box. I don't really understand why they are doing this, I think it's just because they think it's cool and some users are going to appreciate it.