Someone asked me "Risk of what?" when I queried as to whether reducing thrust is safe to do without a definite indicator of thrust reverser deployment. The risk I imagine is making your energy state worse on takeoff or climb by reducing throttle on one or both engines before you know exactly what the problem is.
The thrust reverser control problem has been at it's most difficult to control when some control surfaces were inhibited in later climb stages. If this was the case where you were asking about the possibility of inappropriate engine reduction then I would judge it not to be of significant risk since your aircraft normally has plenty of ground clearance and control speed to maintain safe flight.
I am however sensitive to quick reactions by the crew in pulling back wrong engines and as such far prefer automatic (via FADEC etc.) reductions and not hard shutdowns.
Of course I expect pilot training now covers all these concerns quite well.