Good point. Note that in Black Company the MC goes to great lengths to get others to work to solutions with some hints if necessary rather than just dictate every modern invention. Slower but helps build a culture of modern thinking.
Are these rifles or muskets? If they are rifles reloading 3x per minute then they already have Minnie balls. If muskets this looks like Napoleonic era roughly and corresponds with uniforms looks and tactics, e.g. form square.
I assume this is a slight translation error and he means 30 minutes to go from fridge temp to room temp. 30 minutes is not nearly enough time to unfreeze. Indeed beef should be brought up to closer to room temp before cooking.
You shouldn't defrost frozen meat at air temp anyway since the...
I haven't read ahead or the LN series, but I believe he mentioned earlier the need for Erika to hate him so that she joins the hero party as their main healer, otherwise they will fail to save the world.
Eisen's (the dwarf) single tear on page 34 really got to me with his skinny old dwarf arm when he admits he's too old to wield an axe. It was foreshadowed earlier:
"Eisen hasn't changed much has he?"
"Is that so. So that's how it seems."