Since the RR reduction is only for high elo, specially for the Radiant rank, you can think of this 5 stack queue almost as a different mode completly but inside the regular soloQ. I think they want to focus on people that want the full team...

https://imgur.com/a/7RWrfnK A day off with his buddies ~trying to eat some ice cream, or maybe chill with it in Mosh's case. I made this fanart because he's just too cute, hope you like it !!