As much as I wish for this feature to be expanded beyond 15, we must take into account that on certain devices and depending on the internet's condition, the more medias equates to longer scripts. There also is the intention to discourage spamming, which I am aware that it sounds contradictory as you could just post another message after your intial one, just like you did in that aforementioned video game music thread. Regardless, we must be thoughtful as to not clog up an entire page with just a post riddled with 50 or more YouTube videos, and everyone has to abide by that common courtesy so as to avoid a potential spamfest. Spoiler for the win.