The whole point of the app store is to avoid the mistakes of Magento: building a confusing, monolithic mess because they tried to shoehorn too many features into the core.
So no, Shopify doesn’t have a Wishlist feature. Shopify lists other Saas’ that offer to fill in the many gaps.
That may work for some retailers. As with Magento, some will like that approach and some won’t.
But if you’re telling a retailer that Shopify offers a Wishlist feature you need to be sure to mention that it will cost them $x/month/store and that the app isn’t built nor supported by Shopify.