staking it is not permanent problem and can be undone when necessary. I will say that blue should hold fine in most cases. My rifles with blue hold fine through being bounced all over the place on four wheelers. Never had them even begin to become loose. If I was using it for real work I'd be Ok with the blue but probably prefer staked as it creates a better hold in my opinion. In short I guess you can't go wrong with either and just need to determine what makes you comfortable.
What you don't want to happen is the castle nut getting a little loose then allowing the plate to back out and releasing the spring to the takedown pin. It doesn't take much space/"looseness"at all for the spring to slip past the plate. If it get's loose it could be easily overlooked. next thing you'll experience is picking up your rifle with a missing pin and have it fold in half as you shoulder it.
