When you/me/she/he make a statement, it's your/my/her/his personal opinion. If I say that iOS has more useless than useful apps, do I also have to say every time "in my personal view" to make it obvious?
How am I/he/she/it/them/we supposed to know the difference when someone says something is useless for him/her or for him/her/me/us/them? Perhaps if the person/thing had phrased it differently, their intent would have been known better. Useless means "without useful qualities; of no practical good: a useless person; a useless gadget." It seems to me that Contacts is a useful app, but you may not like it. I don't think it can be called useless in any way shape or form.
The problem is that when people use words incorrectly, it causes unneeded confusion.