No, not at all! The template is there if you'd like to set up your artwork for your own reference before placing an order. Our Artwork team would then used this to set up your order for print, but it is by no means necessary.
You can supply the artwork as you'd like it printed without the template. It just needs to be set up to the correct dimensions of the product you're ordering and have a resolution of 300dpi.
For products, such as mugs or notebooks where you'd just like a logo printed, you can send just the logo with brief instructions on how you'd like the finished item to look. Our Artwork team will then place this logo on our template for you and send over a proof to confirm the sizing and positioning before the order goes into production.