I actually want it back. It was one of the mini-challenges (well not really) of the game, or something that makes it harder, even if it is only a little bit. I still remember trudging through Viridian Forest with my Squirtle, not knowing that poison does damage after battle. The game fuzzed up, and I thought it was broken. XD Then, all of a sudden:
Squirtle fainted. Sol whited out!
Then I learned from there to watch for poison and carry Antidotes and Full heals. But now, it isn't there anymore, and I keep clinging to old habits.