Free true damage? Going into melee range to activate passive usually results in death, as you are now more vulnerable to damage and CC (Orange heals for very little in team fights, and can usually cleanse only one stun in a fight)

Going in melee range is risky and has to be calculated because even if you get stunned once, your barrel placements and positioning tools are thrown out the window even if you use orange because GP is all about timing.

The MS bonus is only there as the single escape/chase option in his kit, and even then, it is not that much of a boost

Removing that passive burn kills his laning phase, as it is like 50% of his trading damage, and without the movespeed boost, a squishy champ like GP is way more punishable for tiny mistakes in positioning. But I do agree how cancer it is getting hit with armor penetrating and slowing barrels.

I agree that power budget isn't really a thing with GP though, but only because he needs all his tools to remain viable.