Idea Summary
User can should Add a product to cart. But now, user must click on product to open new window, and then add or remove product to/from cart. Bur if ADD/REMOVE or PLUS/MINUS in main Card.

Use Case

Speed up the purchase and more user friendly

Preferred Solution (Optional)
Now, I add button HTML tag , and use from onclick button, call JS function, after that update my order table by apex.server.process.