Using pine cones and peanut shells as pot liners is wrong; use them to repel pests, and no matter how much you water, the roots won't rot

Using pine cones and peanut shells as pot liners is wrong! Use them, and they can repel pests, and no matter how much you water, the roots won't rot. Recently I've been reading articles, and there are still many authors saying to use pine cones, peanut shells and the like to line the bottom of flower pots as a drainage layer, claiming the effect on plants is great,...