Comment by mazieres

The problem is that in practice, many people don't take the flamethrower to the shed. I recently had a conversation with someone who was arguing that you don't really need jai because docker works so well. But then it turned out this person regularly runs claude code in yolo mode without a container!

It's like people think that because containers and VMs exist, they are probably going to be using them when a problem happens. But then you are working in your own home directory, you get some compiler error or something that looks like a pain to decipher, and the urge just to fire up claude or codex right then and there to get a quick answer is overwhelming. Empirically, very few people fire up the container at that point, whereas "jai claude" or "jai -D claude" is simple enough to type, and basically works as well as plain claude so you don't have to think about it.