The danger in the first row will definitely be higher, but you have to step back after each volley to reload. At first, the overall unit rate in the first row will not be much higher than that in the back row. Unless you shoot in the British way, the bullet rate in the first platoon will be higher in the March.
Soldiers in the first row also have the most salary and promotion opportunities.
This was the most advanced tactic on earth at that time, and Britain crushed the whole world, including the countries you mentioned. At that time, officers were usually in the first row. You can listen to the March of the British Grenadier, and the song will tell you. This attack method of the British army did not change until the death rate of officers exceeded that of soldiers after World War I. The war at that time was an aristocratic war, and the people standing in the first row were generally aristocratic children. This is mainly to highlight temperament.
This 30-meter volley is aimed at the opposing army, which is also waiting in line for shooting. The technologically backward side can hold a shield in one hand and a broadsword or spear in the other, which is just close, so the musket side may not have much advantage.
Cavalry can't take advantage of lobster soldiers. See the neat array of lobster soldiers and bright bayonets? Far away is the shooting troops, and near is the spear phalanx. At that time, it was the artillery who could really defeat the lobster soldiers. Ordinary soldiers must be under great psychological pressure when they see the opposite side coming with a gun, but because of the poor accuracy and effective distance, the first shooter will basically lose.
This kind of war is divided into many columns and fired from a distance, just like a three-stage attack. When there are many, it can be divided into 10 columns to ensure continuous firepower. There were many casualties before we got close to your side, and the army collapsed.
The cow of the British army is that it can let the opponent shoot twice first, and the soldiers can still hide.