Soft Soil/Clay?! Worried!

We got the news last week when they finally broke ground, the soil/clay is to soft. They will have to dig another 2 feet deep to compact stone down before they can put the footers in and pour the foundation. We have mixed feelings about this. We hear it's a great thing because your home will be "sturdier" but it still leaves worry in the back of our minds? Any opinions on this?!