@back_by_demand : you are right. I'm not talking about OEMs. I'm talking about the contract service providers (and IBM and HP are among them; technically, IBM *was*).
Chrome is for corporate users. 20 seconds boot is just one of the features. The main meat is control, which is imposed on the users by the corporates (client-side) IT departments, remote-data wipe (in case of lost of equipments) and software upgrade.
Using Windows, software upgrade is so painful. Corporates won't use Macs, unless it is a creative corporate. Linux is so far fetch. That's why there is Chrome.