Some weeds can be damaging to property, trees, sidewalks, etc. or are poisonous.

It's not always about being annoyed by dandelions in an otherwise overly fussed over sterile lawn environment.

The bane of my young life was having the job of cutting the grass around the house - we lived in the country at the time and had about 1/2 an acre of lawn as well as fruit trees, plants, vegetables, etc.

We never considered using weedkiller - I just can't see the need. Isn't it just as easy to pull the weed out of the ground as it is to spray round-up on it and wait for it to die, before presumably anyway pulling the remains of it?

Ignoring the health implications completely, I can see some "value" of using round-up in a commercial environment where your dealing with 100s of acres or more but fail to see what benefit it provides in a domestic setting when the number of weeds is small enough that it would just takes minutes to remove them physically and toss them into a compost heap.

But roundup isnt much of an option when the weeds are next to the nice stuff. My compromise is to pull the weeds when I'm motivated to and call it a day.

Herbicides are useful, they certainly help prevent invasive weed species from taking over native plants and grasses. I'm Kentucky I'm always fighting Johnson grass, thistle and Japanese knotweed in my bluegrass

I will say for some weed species that can be ineffective or counterproductive, unfortunately, and for those a chemical (or other) solution may be in order.

Weeds can also be a sign of a potential problem, such as poor drainage, a leak, etc.

Nutsedge is an example of that. As I recall, pulling it out results in it sending more shoots up if you don't get the nut (which can be feet underground).

At that point, you have to continuously pull weeds on a daily (or multiple times daily) basis in order for it to use up more energy growing than it generates.

It likes water, so if it's there, it might be because there's standing water from rain.

I dug up a raised flower bed to get rid of it once. Nuts were absolutely everywhere because of poor drainage. I had to go down 2 feet I think to get them all, I replaced the bottom layers of impermeable clay soil with something that drained, along with a drain pipe or two.

Now the sedge is gone, the risk of foundation damage from being too wet is gone, and no chemicals were required.