I didn’t expect a reply to this old thread of mine, so the email notifications in the last few days were truly out of left field :-).
I barely remember the project I worked on when I asked about this and I seldom work on WordPress anymore, so I no longer have the need for ACF support on product variations. And considering the generally low impact this thread has had in over 2 years, I don’t see ACF focusing on it either.
That said, it’d be a nice feature to have since customizing Product Variations is a true pain in the neck.
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