I have one, and plenty of controllers, but I’d trade a bit of battery life and horsepower for weight. I don’t play AAA games on mine, and I know I’m not alone, so they’d be smart to release a lite version.
And it’s not just the weight. My wife has small hands and can’t play it comfortably because it’s so large. I bought her a WIN400 and threw SteamOS on it and that works alright. Something that size would be amazing from Valve (but without the really fucking stupid control placement).
Small form factor handhelds with power under the hood are definitely a thing, but they’re like $1200. I bet Valve could drop the power by 40% and sell it at a reasonable price point.