I can use the Kairo Train bot or levelling to boost the speed of my Kairobots. Why would I want faster bots? What does this gain me?
According to the in-game help (Page 8, if you're interested):
So faster bots = bots that will survive longer, due to attacking (and hopefully killing) before the enemies have a chance, and getting hit less often. Seeing as how powerful attacks can knock out several bots with one hit, evading it just allowed you to get another attack in.