Not sure
Reasoning:
- Having a Grenadier with a musket act like a musketeer is fairly intuitive - musketeer with funny mitre hat and a bag of grenades? I can tell that’s a heavy Infantry ‘shooter’ with a decent siege attack.
- Having it as a heavy Infantry which is great vs cav and other heavy Infantry at both melee and range makes it a little too powerful plus not as readable. Muskets are your general use ranged attack with the bayonets being the real counter (Caroleans aside).
Harking back to the old RTS ‘Cossacks: European Wars’, everyone had normal, musket-wielding Grenadiers alongside their Musketeers. They shot at range, had bayonets and threw grenades so technically better than Musketeers, however they were far expensive than general troops so it would be ludicrous to have huge armies of them.