There are ways of beating mirror matches of EP leads with Vader, which is to say almost all of them, without resorting to "farm better speed mods". My personal favorite is using DT and Krennic - it they go first, DT springs into action by throwing his granade, messing the enemy cooldowns and taking apart their entire battle plan.
But people are lazy. They want to follow the latest meta without actually taking time to strategize. There are countless teams that could reach the top of arena now.
One example I've thought of - droids. With GK at the lowest he has ever been in arena since his release (and nobody even brought in Traya yet), crit immunity is less of a thing now. So, HK lead with BB8, R2, and two other droids should start at 40% TM (making them faster then anyone else currently in the meta), and every crit will make them faster. But not a single person has even brought up the possibility.
