Having the re-order button on the tracking page is a great feature, but it would be better if we could specify where the URL goes. Similr to the option you already have with the product recommendation links.

The reason for this for us, is many customers who order the wrong size / model will want to change a variant option when re-ordering, not just have the same wrong item added then immediately at checkout.

Also for us it works to send people direct to the product page due to personalised products.