I ran across this page in the Heroku docs...
Naked domains, also called bare or apex domains, are configured in DNS via A-records and have serious availability implications when used in highly available environments such as massive on-premise datacenters, cloud infrastructure services, and platforms like Heroku.
For maximum scalability and resiliency applications should avoid naked domains and instead rely solely on subdomain-based hostnames.
Does anyone here speak Enterprise? What are the "availability implications" they're warning about?
(I notice that http://stackoverflow.com works no problem, so evidently there are viable alternate philosophies on this issue.)