Benefits vs Disadvantages of using DNS for Oracle RAC (12c or 11g)

For nearly all of my Oracle RAC Builds, I've used /etc/hosts and not DNS.  As such I've not been able to take full advantage of GNS and SCANS.
Please note some of your experiences associated with the benefits of using DNS configuration for your Oracle 12c RAC Builds.   I'm building my 12c RAC now and I'm starting to configure DNS so that I can provide my customers with better value/add of High Availability.   I've used /etc/hosts in the past and one of my arguments in using /etc/hosts can be more secure because you only put in the /etc/hosts what you want the node to know.   I also beleave that using /etc/hosts is a lot more simple and perhaps that could be a potential vulnerability.   I've decided to start using DNS and to learn how to make it secure.
Your experiences are appreciated.  Thanks in Advance!

I see no disadvantages using DNS.
What happens with your clients if your DNS goes down? It stop working?
What is the cost to manage the host files from all host desktop and servers?
I see no reason to not use DNS.
> For nearly all of my Oracle RAC Builds, I've used /etc/hosts and not DNS.  As such I've not been able to take full advantage of GNS and SCANS.
Wrong... Full advantage of Clusterware, because is not supported use GNS or SCAN without a DNS.

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