I think the contact form mentions are because Bryan happened to mention contact form in his original question. I know I shouldn't speak for everyone, but I think we're all generally talking about contact information, whether that's a phone number, an email, or a form.
You're right that you should offer more than a form. My guess is a form is probably the least favorable means of contact, though I suspect for some it's their first option. It's usually best to offer as many ways as possible for people to contact you.
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