I don't think that is the case.I don't think anyone will sit here and pretend Armstrong should be starting but giving him 2 minutes at the end of already decided games has virtually no value whatsoever. The step up is massive but as Big Red have shown time and time again you can get away with giving these youngsters meaningful minutes without too much of a drastic drop off over the short term.
Being part of the match day squad is huge for a young lad. Learning how experienced professionals prepare for the game, deal with the build up and then deal with a win or a loss. Getting him on the pitch even for a couple of minutes removes the pressure of a premiership debut which is a landmark in any career.
I think he has been handled well, I think throwing him into the midfield of a struggling team could be difficult for a seventeen year old.
Giving him brief cameos exposes him to what life as a premiership footballer is about without any real pressure to perform.