@jwildeboer totally agree. Having your own domain offers you a lot of possibilities. But there are two hurdles to overcome. First one you described, it's the configuration. People with no technical background don't (want to) understand the details. So it has to be foolproof.
The second one are the costs. Although a domain does not cost a lot (I pay €18/year) not everyone can or is willing to pay this. It's much easier to have a subdomain at Facebook, ... that "costs" nothing.