Shade
Reading Tarot is far too fun to only do it for other people.
Personally, as someone rather trapped (not quite the right word but it'll do) in my conscious mind... I use tarot for the express purpose of talking to my subconscious.
If I'm using it for an external purpose like prediction, then I'm fully capable of seeing the answer I'd rather not receive. Also, by my personal philosophy, the cards can't give me any knowledge that I don't have access to myself anyway... they're just unlocking the door to the bit of me that knows.
All this is to say that we're all different, our philosophies, methods and aims are different... so blanket dictats and judgements are pretty nonsensical.