Nah, you'll prob never need it or use it. I'm not a regular player but despite having a secondary it's never been used in game.
If you're gung-ho or a sneaky beaky bush wookie you might need it, I'm sure most players don't.
I don't play often & live far too far away but I'd actively avoid any skirmish that limited play (other on safety grounds), I get the whole Milsim/Larping thing & understand why players enjoy them but it's not for me.
My reactions are very 56yr old I hit very little but love wasting ammo.