Bill Gates? Where is he?

Do you mean a dedicated gaming flavor of Linux? Because otherwise, isn't that just a console?

Well here you go: https://bazzite.gg/

You should give Bazzite a go on your desktop, it's very similar to SteamOS and the desktop experience has been great for me. I didn't have a Steam Deck and transitioned to it, and the smoothness convinced me to get a Lenovo Legion Go and install Bazzite straight OOTB.

Try Win10 LTSC if you don't want to make the switch to Linux.

I am not gonna use SteamOS. But if a bunch of regular folk do, then it might convince peripheral and game makers it'd be worth putting in a modicum of effort to support linux. That's why I'm excited for SteamOS.

SteamOS is better than, for example, macOS and Windows because of licenses.

Since you're new (welcome!), I should let you in on a little secret: pretty much the entire free software movement is built around licensing. I know, it's boring and seems insignificant. But the outcomes are profound.

Because SteamOS is built to function within the free software ecosystem, it means users are never beholden to the decisions of one centralized entity (usually the company that owns the software patents.)

If Valve ever decides to, say, include candy crush ads in SteamOS' start menu (they'd have to make their own start menu, since right now SteamOS uses one that's already made by the free software community), then users can choose to remove that part of the menu or replace the menu altogether without having to start from scratch.

For wealthy people who can always pay the "proprietary tax," this might seem like a non-issue. Practically speaking, these people only want their software to work without hassle. They don't care about the true cost of that software, such as only one entity being able to modify/distribute the software. It's not until, say, photoshop starts charging a subscription (which they can always increase the price of) that people start to see the value in free software and the importance of licensing.

Microsoft is deeply entrenched and has undergone decades of enshittification. SteamOS is at only the beginning of this cycle. And since SteamOS is linux-based, it's likely to have ramifications for the whole GNU/Linux ecosystem. Furthermore, if there are two vastly different OSes that developers and graphics card manufacturers need to seriously target, they're more likely to write more platform-agnostic software that everyone can benefit from.

Because valve is a private company. They don't have to answer to shareholders. That means, they don't go through enshitifaction, they care about their product and their customers. Are they perfect? Absolutely not, are they good? Better than every single company out there that tries to be like them. Period.