It's a high risk, high reward class. Just because the costs are high does not mean that they get a free pass to skip the training phase.
Which is positively /not/ what anyone is trying to do. The idea is allow them to train while doing something other than sitting at an academy. To let them actually /play/ the class, instead of play the academy for three months. We're not talking about simply removing the risk to infiltrators, and unleashing hordes of ninja-wannabes on the game.
For example, a set of ultra-low risk options that do very little damage, and only give experience to the very low skilled infiltrator. A more experienced infil could use these options, but would do very little damage, and get no experience. If you're doing something /too/ easy, it doesn't even keep your skills sharp, let alone teach you anything new. Missions such as counting taxes, burning food, road signs, etc., may benefit from this kind of thing. And maybe attacking caravans, if that ever gets implemented. Options like blowing up walls and assaulting nobles probably would not.
I envision a range of risk/reward levels that let the infil match his skill to the desired effects. More risk = more reward, both in damage done and experience gained. Don't want much risk? Then you won't do much damage, and won't get much, if any, experience. Need to do a lot of damage in a hurry? Then be prepared to take a big risk. But if it works, the payout is commensurate with the risk taken.
We're trying to add to the game here, not take away.
