Mine are ALWAYS unlinked.
Often when clearing snow, other times when.... Hmmm, dunno.
As others have said, it is a sub conscious thing, I use 'em independently whenever I have to use 'em that way.
I can also get both of them reasonably easily, the pedals are close together, I rarely use wheel brakes to slow, just engine braking.
I don't use turning brakes when I have an implement in the ground - just in case someone asks, that ain't generally a good thing to do.
Lift it, turn with brakes, straighten up for next row, lower it.
{but Ya KNEW that, right ?}