Anyone who still believes caustic's nerfs is totally justifiable is either a Respawn simp or you have no idea how to play apex
Before the nerf, sweaty, tryhard, toxic W-key playstyle people treat his gas like it's a mere obstacle, something that doesn't bother them at all because the game's movement helps them to escape his gas or out-maneuver it completely within a blink of an eye. At its best, his gas only helps him and his team to survive during a third or fourth-party situation by simply blocking the doorway or at best, buy some time and space for his team to revive someone. Only when facing any incompetent player who plays this game 1 hour a week does his gas actually feel strong against them.
Even worse then, he is unplayable for like 70% in Olympus because it's all wasteland out there, barely viable in World Edge because most buildings are so wide-open with tons of way to reroute around. Only in King Canyon and under some very specific ring, location and situation which all combine heavily in favour of him and his team, only then does he feels somewhat powerful. And yet people complain about Caustic being overpowered in a 20-minute long game when there is money on the line and people play as safe as possible and only engage each other when the enemy team are getting gang bang while in any casual or rank lobby two-third of the lobby would already vanish not even before the first ring start closing and the rest of the game are time for people looking for each other.