So this is happening.
I don't play chemist, I don't know the chemistry system, but I read through about three dozen threads complaining about this update over on the TG-station forums when it was implemented over there. This change-list is also going to include changes to the IPC character race to make them metabolize chemicals like organics do, with the ultimate goal of making all chems effect all races the same way.
The expressed reason for doing this is because of 'balance', a thing I've heard of, but I've never seen in any part of the SS13 code-base.
The most exhaustive thread about this over on TG that I've found was this one, and I believe the most recent poll on the topic was this one.
It was a 2-1 vote for a rollback.
You'll also notice, if you check out either of those threads, the enormous banner across the top of the entire feedback forum, ordering people to stop making threads complaining about it, as the place was flooded with threads of people complaining about it.
The reason it remains in TG is apparently that, because it is so all encompassing and so massive a change, removing it would be as much work as integrating it in the first place.
This server isn't TG, and it has a different play culture, maybe everyone here will love it, but I thought I should bring up what I know about it from the other server where it was implemented. It might be a better system, I don't know, but it should probably be talked about before it gets pulled.