I was too fixated on a classical gaming PC with mouse and keyboard.
- Steam's Big Picture mode works, but there are lots of sharp edges (launcher support being the biggest).
- PC versions of games frequently have no way to switch to a couch-friendly UI (loading menus designed for PCs)
- The power management and hardware setup is not at all streamlined
- Controller management can be painful
- Streaming apps mostly need to work in a browser, which won't have controller support.