As someone who plays pantheon a significant amount, I have to say

His Q should be a skillshot.

Not only is this less oppresive to fight against since there is counterplay, but it's more immersive for the panth player because it has counterplay, you have to actually try to hit your opponent.

Of course, his Q would have to go through minions, or else he couldn't bully very well. But, especially if the spear's damage was buffed in compensation, this would create an interesting game in the lane for both players, with one attempting to land spears for big chuncks of damage, and the other would be trying to dodge them, although it is honestly more about the counterplay than anything else. Fighting a panth that you gave first blood or a bit too much extra farm to is nightmarish, I know this, I've been that panth, and since you can't dodge his spears, he can just chuck a spear at you whenever you try to CS. It's just plain oppresive to fight against and there is very little counterplay.

This could also perhaps add depth to his WEQ combo, because since the W stun doesn't last very long, and his Q can now be dodged, both WEQ and WQE are viable options. WEQ for when you are fairly certain you can land your Q, and WQE when less so, because they can't dodge if they are stunned, and you don't realistically miss panth's E even against mobile targets.

Honestly, that's just my 2 cents, I'm not a pantheon god, I've only really started playing him recently tbh, but I feel that this change could add so much more to his kit and make him feel less oppresive to fight against.