The truth is especially with this legendary Summoners that in some rulesets you have no chance if you don't have them.
I personally don't like to fight when I have no chance,
I don't think that you would enjoy doing a 100 meter run against Usain Bolt or you would like it ?
but it is the same like to run with Usain bolt if you play without the legendary summoner at least in some rulesets.