Should they? Should they not?
I personally think they should, or rather, at least implement a setting for competitive/custom games where you can disable them from showing up. Actually allows some surprise 'pocket strats", and perhaps encourages aggressive scouting by someone on your team, especially if you are the defenders. Some people would say "don't implement cheese wtf are you doing" but I think, if anything, it adds another layer to 'mindgames'