It is not bad to leave a tree stump. However, if you do not remove it, the tree stump will eventually decay. The rate of decay depends on the type of wood, the weather conditions, and the type of fungi or bacteria present. Removal is recommended if you want to prevent any potential damage to your property or if you want to avoid the hassle of having to clean up the debris from the decay process.

It's not bad to leave a tree stump; it's actually good for the environment. Tree stumps provide homes for insects and animals, and they also help to break up the soil. If you're not going to use the stump for anything, you can always have it removed by a professional.