Well, they are opening the Creators section, with lessened requirements. Perhaps a one with even less requirements (like the game is allowed to use only keyboard, or this game puts the settings burden on the user) so devs can easily dump their games, and afterwards, if they find it worth it, upgrade as a regular Xbox game.
It just sounds like a sub-par, "not a console" experience. The key thing for consoles is simplicity: you don't get a choice, you just put the disk in and it works and the experience is consistent, hence the stringent TCRs on console.
If you suddenly have a category of titles that need a keyboard, don't show your Gamertag or friends list and don't give you achievements then you've fragmented the experience - which is against the ethos of consoles IMO. "Just dumping games on the system" sounds like a recipe for reduced quality. Also then 'regular' games would start asking why they have to go to the expensive of meeting the TCRs if they could just do a centennial port of the PC version.
No, IMO the value prop of Centennial is a quick port
plus easy addition of platform-specific features so devs get the benefit of a reduced cost to market and console owners continue to get 'the Xbox experience'.
On your general point though I agree that centennial is an exciting technology with a lot of potential.