Respawn Entertainment did an Apex Legends AMA on Reddit and has answered quite a few questions on Legend balance. Daniel Klein took the brunt of the questions including ones on Wattson and Lifeline. This time it's about Caustic.
Klein was asked, "Can you please explain to me a little bit the impact that the Gas nerf caused on Caustic? How different was his win/loss ratio?"
His answer was surprising, "Caustic's win/loss ratio barely changed with the nerf. It went from 5.1% to 5.0%. His PICK rate however dropped a lot, so there's a lot of survivor bias here; the common explanation is that only Caustic mains stuck around after the nerf, so that kind of self selection undid a lot of the impact of the nerf. We're thinking about what to do with him--we could just up the damage again, maybe find an inbetween point where he's okay, but I want us to spend some time thinking of non-damage outputs we could use on the gas. The goal is that people should be terrified of your gas and try to leave ASAP. That's currently not the case, and we will fix it. No ETA, as always."
Respawn wants to find ways to fix Legends without touching damage elements. While most want the gas damage to increase, Klein thinks that wouldn't fix anything. Respawn will continue to think of unique ideas to make Caustic powerful without increasing his damage.