Is low churn actually a sign of product market fit, or just high switching costs?

We were celebrating a steady drop in our monthly churn rate, assuming it meant users were genuinely loving the product. But during recent feedback calls, a few long-term customers admitted they stay mostly because transferring their data and workflow to an alternative feels like too much work.

It made me realize that passive retention can easily hide a lack of real product delight.

How do you distinguish between customers who stay because they genuinely love your product versus those who are just locked in?