this transform/brew potion/alchemy type skill can only be used in specific locations. No hiding in guilds to brew. No teleporting to Hillcrest or Spiderhaunt to brew quietly by yourself. No brewing while chameleon'd.

You can only brew in locations like the mage wing in drow city, HToS, Thar Acacia, maybe a separate location in Galadon that is not under Trib protection, and so on.

The brewing assistants or instruments can be attacked and destroyed.

Brewing a potion take 6 to 10 rounds of lag.

The brewing reagents can only be stored in special containers so the larger ones or ones you can wear are especially valuable. Most containers are small which helps minimize reagent farming.

And so on.