when you clean a record in such a way that it removes the dirt without physically affecting the vinyl it reveals the natural gloss of whatever non-scuffed part of the vinyl / styrene is left. when you clean a record in such a way that it actually "polishes" the vinyl, effectively skimming it or taking off part of a layer, it has an unnatural shine that masks the real playing condition. One of my pet peeves is polished records. Other people might not mind. But it is purely aesthetic and doesn't improve play past cleaning the dirt. The improvement in play you do get from the furniture polish is from the part where it does actually clean some of the dirt.
WD-40 permanently embeds itself in the grooves and binds to them and creates an unnatural shine that's totally visible. If you take a mint record and spray WD-40 on it, it doesn't look the same as before, does it? Any cleaning method should be applicable to a mint record and leave it looking and playing exactly the same as if you didn't clean it.