User blog comment:Willbachbakal/Singleplayer Gene Tonics/@comment-3567720-20110703141443/@comment-1330314-20110703183928

Thanks for commenting. Lore-wise, the Security Bot Tonics don't make any immediate sense, but what I had in mind was that they'd change your genetic signature so that your Bots would act differently (the Sapper Tonic) or so that they'd share a common network through you (the Bot Brothers Tonic).

As I see it, the problem with Fountain of Youth is that on one hand it rewards you for doing literally nothing for several minutes, with is neither fun nor productive, and on the other hand it messed up a carefully engineered resource system. The BioShock series so far is part of the survival horror genre, and your resources are supposed to be in scarce supply (granted, you have tons of loot lying everywhere, but it's still limited). Having a Tonic that gives you infinite health and EVE, your two most precious resources in the game, removes any semblance of risk and fighting for survival, since you just have to take a bath to be okay again.