Generally speaking, you're right.
But Bazzite is different. It's built on uBlue/ Fedora Atomic and therefore barely needs maintenance, both for the devs and the users. Keeping a distro secure and updated is a huge burden normally, but here, it's done from upstream via Github-actions.
Also, community wise, it already has a big one AND Fedora Atomic guides also apply to that, e.g. install scripts.
Another pro is that the Nvidia drivers are baked into the image, so if they break, they're instantly fixed by the devs, because then everyone has a broken system. But that's no problem, since you can just roll back in seconds.
For a pure gaming focused device like this one, a special distro makes sense. You'll get a better experience and performance compared to Mint for example, due to kernel patches, built in tools, etc.