Reevaluating the stuff in your kits is you thinking about the uses things have, and thinking about the compromises you are making when you choose things. Pulling your stuff out, looking at it, handling it, and putting it back in gets you familiar with it, should you ever need it.
Do I need the three knives I brought with me to work this morning? No, it's just a sign that I have a knife problem. If I thought it wouldn't cause problems, i'd be tempted to wear a big sheath in my NYC Office. Knives come with me, in part, because, like many, I like knives. Part of your thoughts should examine what may be left out and could really help, so you can carry something because you simply want it or more of something. I think one of my knives may find a home here in my office, jsut in case I should ever come in with my EDC/PSK kit.
And your stuff needs to change for the environment and activity. When you are out in the middle of the woods, with plans on staying for the weekend, maybe you need to bring the axe. When you are simply going for a hike for a matter of hours, then maybe the axe stays behind and your bring the machete.
So once in a while, break all your stuff out on the floor, turn on the TV, crack open a decent beer and think about what you need and want, and then put it all away and get another cold one.