You have to have a very safe work environment for that to happen. Otherwise, saying "I was blocked by person X" finding the wrong ears is a great way for person X to wind up on a PIP if the company's management is sufficiently inept.
I do miss being able to be honest at work.
Edit: rereading my comment, I realized I could have been clearer. What I really was getting at was the motivation: how do we help each other avoid the problem in the future, versus "everyone but person X can feel okay about what happened".
We missed a pretty big deadline not too long ago. In the retro, I accepted a lion's share of the responsibility. I'm a senior dev rather than a team lead, but I had my head down during a lot of the technical discussions and PRs rather than diving deep with the juniors and mid-levels. I apologized for it.
I have made myself more available since then. PRs have been under more scrutiny from everyone, and I feel like the constructive feedback and requests for comments have been flowing more openly.
There’s an excellent talk [0] that discusses why and how blameless has missed the mark. Somewhat compressed version of the same talk by the same person here [1].