The slide rule creates more injuries than prevents them. You’re asking a guy to give up feet first and a defender to stop mid-attack. The proper rule is if you’re a Qb the same rule applies as everybody else. You’ll see a lot less QB runs and a lot more smart low shoulder running.What I don't love is that there seems to be certain plays where the QB sees they're about to take a hit and then slide... by that point the defender is already committed and it's an impossible situation.
That said you could probably fix that (and many issues) by adopting a rugby tackle rule. The launch tackles are not legal tackles, you have to wrap and take the player down. Bring back form tackling.