Exactly. Why do you think Amazon bought Whole Foods? It wasn't to get into the organic grocery industry. It was WF's real estate and supply chain logistics that put Amazon delivery as close as possible to their customers.
Let's flip it the other way. Management will have to decide that it costs less to have a union than it does to fight it.
Having a union will mean paying higher wages and benefits, and less flexibility. That is a cost.
It will provide savings in terms of far less employee turnover and a smaller HR function because of fewer points of contact.
Everything in between is up to the company to manage skillfully.
I would also add that men are more likely to overstate their contribution to tasks like grocery shopping. My husband still marvels that I notice when we are running low on staples and think to pick up replenishments. He waits until we are fresh out then, bless his heart, might remember to go out and "slay" (his word) some groceries.