Once patch in #1029002: Add to cart form should optionally show when there is only one associated product gets merged we will be able to display product attributes even if there is just one variation. But that variation will be displayed, ie, in a select with just one option. It's how most ecommerce platforms behave, but it's not good.
We should give an option to render the field differently by embeding field/instance settings, just like 'Enable this field to function as an attribute field on Add to Cart forms' is right now. So, 'If only one variation available, render this field using this formatter', and below it formatter selector, and its settings.
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Comment #1
rszrama commentedThis apparently got added through some other issue via a setting on the Add to Cart form display formatter: