"Otherwise, I do not see a point in entering 1099 information unless there is withholding."

Yes.

"Otherwise, I would just enter 1099 amounts on Sch. C."

No. You enter their entire business activities. The 1099-Misc is one entity having a reporting requirement because of whatever activity that was, which is one of the boxes has an entry and that box has a reporting threshold.

But the whole business is likely more activity than one value in one box.