The more that you need a system the less the designers need to care about UX. If this one service is something you absolutely have to use, then you will use it

The more that you need a system the less the designers need to care about UX. If this one service is something you absolutely have to use, then you will use it regardless of awful UX, because you have to. Conversely, if the service is something that's simply nice or fun to use, or there are tons of alternatives, then the UX must be good or people will go without your service or use an alternative.