you dont have to unroot for hardware issue like this since normally manufacturer treat hardware and software issue separately.
but if it's not a hassle, i dont see why u shouldnt just unroot it

and i can see that u are ready to pay for the damage, so it's best for u to send ur screen to samsung straight away. based on my experience with samsung, they can change the lcd in just 1 hour, as long as they have it in stock.

and by sending to Samsung, u wont void other parts warranty since removing the screen needs removal of other parts.