I don't see any problem at all (in fact I support it) with displaying reproductions for the reasons you pointed out. But my problem is when someone has a set made and then hangs them on the wall (taking credit for the harvest) And this is being done!!, I will give you an example, I was fishing with a guy and he caught a nice pike, he released it, but before doing so, we measured it, weighted it, took pictures of it, so he could have a reproduction made, well,, when he received his mount it looked rather large to me, I asked him about it, being a good friend he confided in me that he use the "power of the pencil" and added a little here and there. (more than a little imop).
I certainly do not want to start an argument but reproductions are not real!! They are fake, no matter how good or detailed the reproduction is, (a fake $10 no matter how good--is still a fake)

I have seen (as I am sure you have) manufactured antlers, I know a guy who has a couple of nice mounts which were man-made (fake) he doesn't take credit for them, but has them in his store. I have some nice wildlife mounts, I earned everyone of them, and it really "turns my Crank" when I see someone passing off a fake as one they "Worked" so hard to get. NO DISRESPECT to anyone!!! but I don't look very positive at a taxidermist who will do this for someone. There is nothing wrong with reproducing the "Great Ones" so we can all see them. I am like you, I enjoy looking at a large set of antlers, BUT I want them to have came off a deer,,, Not taken out of a mold. Doc