Some of these weeds help the soil. They grow in areas where other plants can't grow. But I understand that if you are trying to grow specific plants, for food or aesthetics, you will need to remove the plants that will kill them (vines or fast growing weeds that take the sun cover). I think dandelions help move calcium to the top soil, and loosen hard soil, is an example of a weed that helps.

I am adding more areas to my yard where I put a small garden fence and let whatever grow (minus trees), which will be mostly weeds I presume. This will help the local bees and insects and birds. I think there is a movement to do more of this, but don't recall the name of it.

After we destroy a piece of land, its gonna be weeds that will bring it back to life.