Talking enables what's hidden to become unhidden and then thought about.
It's in the processing that change occurs. If we want change that is.
Sometimes that happens yrs down the line.

You don't have to snog a T, Just trust a T that's trustworthy .
This takes time and requires a skilled T that's experienced these things personally. If they're just out of grad sch or never undergone in - depth therapy then they don't know these things on a feeling level, How can they help with something they've never experienced, and I don't mean thy have to have experienced same traumas, Just that they've had the experience of bringing up unconscious stuff to consciousness and then thinking about It.

It will like just venting if the T hasn't the skill to show you what the venting is about.