You have to really be pinching pennies to get one of those plans. Even on Aldi Talk, you'd only pay €3 more per month for unlimited calls and SMS than you would for a data-only plan.
I wouldn't say it's common in Germany. I just checked some providers and most of them just have one line saying "Phone and SMS flatrate to all German networks" in their plans. The only differentiation between plans these days is how much data is included.