LC questions were and are much more niche. There isn't a lot of advantage to posting one. Posting a brand new moveset for a brand new Pokémon would get you a lot of points.
Additionally, several people would post the same moveset question. How would we decide which of them stay up? If 5 people asked what's a good moveset for Inteleon, how would we decide which one stays up? Favouritism? This hasn't happened yet for LC so this isn't an issue for that.
Lastly, PM is already busy. People don't even ask LC questions that often, why add work to his load when people are hardly going to actually use it