It's not that we couldn't backpack through a 27; it's that since you won't be able to hurt anything and pretty much everything will one shot you, there's not much that can be "taught" since the "strategy" will be "go hide". There are lots of people that generally want to do this that put the time to get in their 29 and up character, so I have a policy to take them in the tutorial raids since they can perform a role that doesn't include hiding. Get that level up and you'll be good to go.