First, let me express that I don't play games like this:
- Grand Theft Auto V Online (Blocked due to BattlEye not enabled for Proton)
- Destiny 2
- Valorant (Blocked due to the proprietary Vanguard anti-cheat)
- Fortnite (Epic Games has not enabled EAC support for Linux)
- Call of Duty (Modern Titles) (Blocked by the kernel-level RICOCHET anti-cheat)
- Apex Legends
- Battlefield 2042/ 6 (Blocked by EA's custom anti-cheat)
- Tom Clancy's Rainbow Six Siege
- PUBG: Battlegrounds
So the answer to the OP is I don't give a shit and the Gabecube isn't my main platform anyway, just for small PC exclusives. I'm a PS6 man.
First I'll answer your question. Convenience and support. Prebuilt will be plug and play and Gabecube will likely have Gabecube verified games like Steamdeck. Now I will rant.
This is a low end/mid level PC, a my first PC. It isn't futureproof and furthermore I just built a PC yesterday for a buddy. Wanna see current PC prices for a non-future proofed build?
You want future proofing and modularity from what is likely a 399-499 prebuilt in a bespoke mini enclosure and I just don't know what to tell you.
None of this works like that. The point of the steam machine is it is probably the cost of half a decent video card for your real PC and because of the low cost you can just buy an upgraded one in a few years instead of upgrading the one you already have. Like a console and most also perhaps like an Xbox-PC. Do you understand what a decent gaming PC costs vs what this whole system will cost? It's priced to sell and requires no assembly. You want it future proofed at 500 bucks? That's impossible bro.