I told him of my thoughts of it feeling a little staged. He felt like this was something that we needed to get past. If he waited for a fight we'd be waiting forever as we get along very well.
Sometimes the relationship itself needs the spanking, either to establish the husband's authority (as in their case) or to defuse other issues that linger between the couple.
By being deliberately unfair, Dynomite's husband was able to establish the authority that she needed and begin to clear the air of uncertainty between them.
That's not to say that fairness is unimportant, just that fairness can and should be set aside now and then.
Don't wait for a fight or argument or serious misbehavior. If she needs to be disciplined, do it. Taken in Hand is not a justice system, it is a relationship.
There does not need to be a balance between specific misbehavior and warranted punishment. Sometimes you just know what needs to be done and you do it, for no reason other than “because I said so”.
Some couples use maintenance spankings and these can serve the purpose. If you don't like the idea of a completely unwarranted spanking, you can punish hard for something small. There are always small things that need correcting.
If you read Dynomite's post, you will see that despite the staged nature of the spanking and the unfair harshness of the punishment, she felt good about it.
Authority does not require perfection, but it does require exercise.