Sorry Doug, I don't agree with that. One of Wikitree's main goals is to create a one world tree and merges are essential to meeting that goal.
I also believe that part of the criteria for receiving the pre-1500 badge, is that the person is willing to use their acknowledged skills and experience to assist others with Wikitree, including assisting with pre-1500 merges.
Having said that, I have at times obsessed over the types of merges you mean, where there are few sources and it can be difficult to really tell if they are the same person. However on a pragmatic level, if there are no sources on one or both profiles, then if everything else is the same, there can surely be little harm in merging the two profiles.
The only suggestion I would make is to make sure there isn't a third or fourth profile for the same person that need to be factored into the merges.