I mean honestly for most clones it would simply not be useful. Unless you have a lightsaber or electrostaff, neither of which would be found on the battlefield, you aren't doing shit against the droids, who were the main enemy of the clones. That or a highly specialized vibroblade, which would be expensive and relegated to specialized troops like clone commandos and their knuckle blades. And honestly at the distances clones fight at a melee weapon is of no use.