Chef Nomi want users to make their own trading UI. Custom-made UI will run on private servers. Server admin can change code at any moment - ask users sign malicious transactions. Users don't look at transaction code.
This is why BTC, ETH etc have downloadable clients. Integrity of downloaded client can be verified via its hash, which is published by auditors. Downloaded client won't update without permission.
Will we pay developers from the devshare to make a downloadable client?