Of course the people selling it are gonna recommend. Just a basic google search will show it. Watch a washer repair video on YouTube and they will mention it every time.

Here’s a quick google search: “The fatty, clumpy nature of fabric softener can lead to residue buildup in the machine’s dispenser, pipes, and drum, potentially causing clogs, mold growth, and even making your clothes smell musty.”

Source: I used the peanut between my ears.