The "unless you use deep links" parenthetical kills the entire article. Not providing a call to action that allows your customer to make the purchase is just bothering the user to no effect!

Are people seriously sending out emails that say "This dress you might like is available in your size. Please open our app, find our search feature, remember the name of the dress we were telling you about, input your size that we apparently already know, add it to your cart, and checkout"?