Am I tripping? This idea is not new, right?
a quick search:
GOG Galaxy
– Created by GOG (Good Old Games).
– Its main feature is the ability to integrate Steam, Epic, Origin, Uplay, and other platforms into a single library. You can launch games and track friends across platforms from one place.
Playnite
– An open‑source, highly customizable launcher.
– Supports Steam, GOG, Epic, Origin, Battle.net, Uplay, Xbox App (Windows Store), and even emulators.
– Probably the best and most "power‑user" option right now.
LaunchBox / Big Box
– Primarily for retro and emulated games, but can also be configured for modern platforms.
– Highly customizable and great for "all‑in‑one" setups.
Xbox App (Windows) / Game Bar
– Tries to unify Xbox Game Pass and Microsoft Store games.
– Doesn't cover Steam or others.
Playnite vs GOG Galaxy
– Both are popular among PC gamers for centralizing libraries. Playnite is more customizable, while GOG Galaxy is more user‑friendly.
Why this hasn't become universal?
Each platform (Steam, Epic, Xbox, etc.) has its own interests and doesn't want to give up control over its user experience and revenue stream, so making one truly official, universally supported app is challenging.