No i presumed purchasing “non stick” tin liners would eliminate all of that, if not, what is the point of their existence you may as well just grease the tin?
A perfectly reasonable thing to think. The reality is that non-stick never is 100% non-stick and some baked goods will stick to them. That’s why when you prepare a non-stick bake pan, you still spray it like you would if it were plain metal. And then you put in parchment and then spray the parchment.
Although this is a lot of trouble and you may wonder why bother with the parchment/liners, this belts + suspenders strategy does ensure your baked goods don’t stick to the pans, which can destroy them when you force them out. For cupcakes, I don’t care if the cake sticks to the liners, so I don’t spray them, but I always spray the liners for layer cakes.