You're right, there's also a bootstrap thing, they couldn't know before installing. The only thing they'd know would be "it's by Google". But all the point listed above were strong factors for newbs too. They could easily discard it if it was an annoyance I believe.
With all due respect, none of the pluses you mentioned would be a reason for a random, tech-illiterate, using-a-computer-for-FB person to install Chrome.