Bazzite is seeing an insane amount of growth right now
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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What exactly do you think someone is going to have to do that isn't easily done on Bazzite? Bazzite isn't based around Steam. 99% of users will install everything they need from Flathub and be perfectly fine.
Also, you can do anything you want with an "immutable" distro, it's just done differently. Immutable is a bad and unclear descriptor, which is why Bazzite uses atomic.