Is grouping some unheard of concept pre-platinum?

Like, hey guys. We have 2 full tanks, and a ton of CC in the front and mid line. We also have a twitch and cait back line, lets group and cc them to death.

but no, lets have the sion split push, the reksai try his best to 1v5, and the Aurelion sol to just rush full speed ahead into a lux combo.