Hi again @wd40!
Similarly to the weird postcode thing you wrote in about, pretty much every e-com has coupons at checkout regardless if you use them or not (not just Square). I've used Squarespace, Shopify, WooCommerce and Ecwid, and they all have it (without option to hide).
There may be possibility in the future if Square builds out more customisation for sellers (ie adds css support), this potentially could be hidden with some simple styling code. But with that said, all the other platforms give you almost no editing ability to checkout pages (I'd assume given the security on these pages with taking payments etc, they lock them down to prevent bad things being added).
We use Square Appointments for our barber shop and sell products through Square Online. We also rarely use coupons for product, but we just live with the field being there given it seems to be an industry norm. Would be a nice feature to hide it though!
