This isn’t an absolute necessity but it is a nice feature to have. Laptops are prone to overheating because the hardware components are close to one another and often times there isn’t much room for air circulation. If your laptop overheats, it can do a lot of damage to the hardware as well as you if you happen to be using the laptop on your laptop. Not to mention there were studies done where overusing a laptop in your lap can cause male infertility, something that males definitely want to avoid in this day and age when fertility issues are on the rise anyway.