Immutable OSes are difficult to use for coding or other tasks that include installing many terminal utilities and for that reason, I don't recommend them and certainly don't want them to be the future of Linux distros. And if I'm going to create a container running a different distro to install and run the apps I want to use, then I may as well use that distro on my host.
A question - can I use Bazzite for uses other than gaming? I game on my laptop, but most of the time I'm writing code. Could I use it for that or should I go for something like Fedora, Debian or Arch?
I use Vesktop, it has a flatpak release and flatpak auto-updates it for me. Also it includes Vencord, so I can add as many plugins and custom themes I want.