His first example is round robin DNS. Sorry, but the terms DNS failover and round robin are often used interchangeably when you're dealing with business continuity.

Yes, certainly there are other options that increase the complexity, but why not start there? While the impact to users on shitty ISPs or behind proxies is unfortunate, it is relatively easy to implement and low-cost.

Going beyond that increases the complexity and cost exponentially and is certainly not easy.