Because its incredibly clumsy and you dont save any time if you have to reload all of them one by one anyway. So what they did was have rear ranks reload muskets and pess them to front ranks to shoot. Its way more convenient, achieves the same but each soldier only has to carry and care about one musket at a time.
In the past many things had been tried, some units, especially cavalry, had carried multiple pairs of pistols with them, shoot them all, then go back to rear to reload. But it turned out to be no match to infantry firing steady volleys in massed ranks.
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