Why do weed whackers/weed eaters often use plastic string and not metal wire?

Question

Why do weed whackers/weed eaters often use plastic string and not metal wire?

In: Other

Answer 1

It’s safer. A plastic string like that slapping your leg is going to hurt a bit but And at worst maybe leave a little bruise, but a metal string slapping your leg like that can easily chop into it and cause some real damage

Not to mention that naturally parts of the string break off during use and you don’t really want little sharp metal slivers randomly scattered throughout your lawn