True, but if I decide to say that shit tastes like candy, then that means that, according to that definition, shit tastes like candy (and if the equality property is true, then also the reverse?:-P).
That still does not make it "better", by any normal definition of that word.
They're travel mugs for commuting and driving. The wide base means it's less likely to tip over and spill. They were produced before the widespread adoption of cupholders in vehicles.