It sounds nice, but in practice, this advice is basically a more positive way of saying "Choose a horrible name that's impossible to remember" — because those a

It sounds nice, but in practice, this advice is basically a more positive way of saying "Choose a horrible name that's impossible to remember" — because those are pretty much your only choices. All simple words are taken. A huge amount of sensible phrases are taken. You can get creative and go the Dribbble route, but now you get the downside of not owning the domain most people expect and the downside of having a horrible name.