I agree that in most cases any issues with a movement like the dip should be addressed. A combination of mobility training along with strength training through alternative movements should take care of any pain and make the dip a viable movement for most people. I had huge shoulder issues when I was young, from playing offensive line in high school. My shoulders would dislocate then pop back in very quickly, causing me a lot of pain. I can do dips today like a champ, with no pain at all.
That being said, I also think that dips are one of a group of movements that could be a bad idea for certain people. If you find that a combination of development of muscular strength, mobility training over an extended period of time, and focus on form doesn't help with the pain, stick to alternative movements. It's not that big of a loss.
Current PRs at 242, raw w/ wraps- 525, 355, 605, 1485
Roboro tui, perimo vester adversarius
(Build yourself, destroy your enemy)