You're overlooking a few relevant factors. More can always be said on the matter if anyone would like to expand further on the little quirks of Early Modern warfare; for the meantime, I commend to your attention the appropriate section of the FAQ, specifically the headers 'Why did European armies use Linear Tactics?' and 'Mechanics of Linear Tactics'.

Adding onto that section, a few more posts:

• u/StoryWonker has an overview of the relevant factors;
• u/dandan_noodles looks at the dimensions of combat;
• and on the degree of risk and likelihood of lethality;
• and in conjunction with u/PartyMoses, the relative risks of being in formation;
• PartyMoses also covers the dimensions of combat;
• and also how the fighting should go, according to one contemporary theory.