Imports are another story. Yes, repeaters can be used, but it requires special handling when importing from some other source. My personal preference is WP All Import Pro.
If you’re talking about product attributes, if you’re using WooCommerce you might want to import into there instead of using ACF. But it all depends on what you’re going to do with the values and what the attributes represent. A useful links field seems like a good use of a repeater while it might not be the right choice for other types of data.
