A technical user, sure. But that's an awfully big step down in security guarantees: "Hardened, secure boot with guaranteed validity and authentication at each step." to "Wait, did we install Ubuntu on this box?"
Also it could have the effect of associating the Ubuntu splash screen with malware in the users mind. Given that many users associate a black linux commandline prompt with malicious hackers, this might cement in their minds that linux is bad.
They should have a splash screen saying: "Now booting Ubuntu Linux. If one of the next screens says "Welcome to Microsoft Windows", your system is probably infested with malware.
