Balancing Question about Monitor Lizard

I'm real new to the game and from what I know it's a 1 man or small dev team so things take time, even more so cause it's the holiday time.

But as someone new, I kinda wanted to ask a meta/balance question that maybe people playing longer can answer.

From what I can see, Pufferfish used to be very similar to Monitor Lizard, but looks like it got changed "nerfed" or was removed from the game for the moment. So just wondering, was Pufferfish just ungodly broken and like 5x better then current Monitor builds? Or is Monitor Lizard acting like Pufferfish but just didn't get changed?

Just struck me as odd after 30 or so hours of play, that 1 item got removed/changed but another item that's almost identical is still in the game? If the devs are making big changes to poison items I get it. Def seems like it could be hard to balance.