Why doesn't melee range Panth Q crit?

Yes. I find it quite balanced that in order to get the crit, you need to use the longer cooldown and are subject to the -50% damage through minions.

Basically the crit is somewhat of a risk/reward.

Not really imo since it the only way to get consistent damage. And with the 50% reduce damage if it hit another target negates the whole purpose of the excute espically when it a skill shot make it more frustrating.

Well he could crit in melee range with 5 stacks at least.