I'm not sure how many people actually know how some of the anti crowd control abilities work in effect.

- Purify: cleanses most crowd control but LBs and Miracle of Nature. Once something gets cleansed, you get a further 5s of cc immunity out of it.
- Guard (used before being cced): prevents any cc to be applied to you unless it comes from a LB (RPR/DNC come to mind).
- Guard (used after being cced): cleanses everything that doesn't make you lose control over your character/abilities, meaning soft cc like bind, heavy, half asleep, etc.
- Aquaveil/Meikyo: cleanse anything that's purifiable, but do NOT grant cc immunity when active.
- Warden's Paean: cleanses anything that's purifiable, else grants cc immunity when active.

I do believe the tooltips ingame are completely unable to convey those subtleties to players and should be improved in order to be.

Special mention to the pull in of Salted Earth that cannot be prevented unless you're guarding already...