Comment Re:obvious reason (Score 1) 101
So you create a working configuration, and you script it.
This is not your neighborhood club's web site. This is Google. I'm sure they have the resources at hand to do configuration management on their DNS servers. So, once it's set up, you just need to renew the registrar's DS records appropriately. You need to communicate with your registrar regularly, anyway, to keep your zone from expiring. Unless you want your cloud to fall down like a Microsoft cloud.
Greater complexity is usually greater risk, but we already know that not having DNSSEC is risky. DNSSEC was invented to eliminate certain types of risks.