Why can't we check Ping outside of game?

You know when you are about to go play ranked and you load in and then you find out you have 900+ ping for some random reason, of course unless you checked your ping in a custom game before hand you wouldn't know how much ping you had and for a lot of people 300+ is somewhat laggy and effects their gameplay. So why don't we have a ping check thingamajig in the client before you enter queue so that you know if you are going to have a laggy game or not, this would solve so many issues with people not being able to play properly cause of lag or DCing issues before they ever enter queue. And the reason it is before queue is because if it was in champ select you would have like a 50% increase in queue dodges cause they saw their ping spike and go oh shit.