In my experience it's the opposite that the customer will want though.
A company may offer sitename.xenforocloud.com by standard, but many users, especially business users don't want that. They have their own brand they want to build and promote. So a company will offer a 'white label' product and charge the end user extra to remove the xenforocloud aspect from it.
The fact that XF are including .community.forum out of the box, without paying extra, for every plan, is a huge value add. It's being able to white label your community url out of the box while still having an incredibly valuable, readable and meaningful custom URL that reflects that it's a forum.
It's brilliant.
For anyone that cares enough, it doesn't take much to figure out if the site is running on XF or not. And eventually, once XF cloud blows up, which with the way it's progressing, that seems pretty promising, then the .community.forum URL will end up becoming synonymous with the XF brand anyway without the in your face shoving of the brand name into the url.