I think this adds quite a bit of code verbosity for little gain.  It doesn't take long for new users to figure out that you're calling things on the context.

Perhaps being more clear about why "The unfortunate side effect is the temptation to use direct access from within the interactor itself for convenience" is actually an unfortunate side effect would help me understand why this is a good thing vs syntactical bloat.  

From where I'm sitting, that's actually a very useful thing for anything beyond a basic interactor, not an unfortunate side effect.