Sure you can eat weeds. Sure you can let them grow. But for the most part people want to get rid of them.
Leaving certain weeds on your vegetable beds make a great mulch and improve the soil but STILL there are others that are so vigorous they choke out anything else you're trying to grow.
These are my best weeding tips and the only 3 tools I use for weeding.
Dutch Hoe - https://amzn.to/3NzCaYy
4 prong tap root weeder - https://amzn.to/3to0GDX
Cobrahead Weeder - https://amzn.to/3tpejmk