Hey there noodlebowls -- first off, love the username! But, maybe that's because I'm hungry. 🙂 I see what you mean on the suppliers' pages where there isn't the import icon. Once you go to a supplier page, you simply need to click into the product and the import icon will appear. It's just that you cannot import from the collection page of each supplier. So it's an extra step, but you can still filter down by the supplier and then import.
It's a good point though and something I'm happy to add to our merchant suggestions workshop where we incorporate new features and fix pain points just like this! Thanks for your comment and as always, we're here to help, so don't hesitate to reach out and ASK away.