He literally explained why he included that part. If you are a player with very few champions but have reached gold, it only makes sense you'd be concerned about getting a skin for a champ you don't own.
Victorious skin has been for a champion important to the meta every single year.
Morgana, Orianna, Maokai, Graves etc are or were very popular champs when they received them. Maokai was pick/ban status in top lane when he got his.