You can use Bazzite to code just fine. The great thing about OS like Bazzite is it's so easy to switch to many other atomic/immutable distros. You're not locked in. You can just 'rebase' it to Aurora with a command, which is the development focused version by the same team.

Yes, especially if it's your first distro and you haven't learned habits from non immutable distros. Distrobox and flatpak cover most, and technically, you can install other stuff with rpm-ostree, at the cost of some space and longer update times the more you layer on.

I personally had some trouble wrapping my head around distrobox while using bazzite and trying to install coding dependencies, but I've been having a great time gaming and programming on Nobara! The nice thing with Bazzite is the integrated distrobox which lets you run something under any linux OS (and even windows, I think?), and should theoretically be good for coding, so if you spend more time than me you should be able to program just fine. Maybe VSCode with remote ssh addon or something.

I think they even have a developer version of Bazzite. Not sure what the differences are though.