You don't want to go introducing any more nutrients to your soil than necessary... excess nutrients can disrupt the soil's microbial community, and in more chronic cases contribute to the rapid breakdown of organic matter, decreasing the quality of the soil over time. Fertilizer of any kind isn't something you're able to add to soil preemptively, especially something as mobile as calcium, and expect it to sit around doing nothing in the meantime... if things look fine now, changing the soil conditions may just lead to a turn for the worse.
Soil chemistry is funny and complicated and I wish I knew more about it, but nonintervention is usually the best route if you can help it. I generally only hit the plants with the Cal-Mag if it looks like they need it.