They exist, they are clearly placed in most keys and, equally, are avoided or substituted by many players.
I tried to use them but I didn't learn any when beginning so, as with all new chords, they don't come to hand automatically. I usually substitute something similar but different.
A short bridge to modulation instead of jumping off a cliff.


Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe