We may have 25% less radioactive elements in our planet's interior than some of these other planets, but we have a large moon that is causing a significant amount of tidal friction. That should help close the internal heat gap a bit...and as a bonus it keeps our axis fairly stable.
There are many different types of homes out there. Some just have better floor heating than Earth. I rather like our bright heat lamp in the sky...so do the plants in my yard.
A good discovery nonetheless. I'm excited that life may have more places where it can exist, and perhaps even thrive like it has done here on Earth.