You may say that there is really no need for you to have security software on your device, but in fact, you are deeply wrong here. As the company says, they worry about their own products, and wants you to have full security on them. there are some malware and viruses that can deeply harm your devices.
So, if you have plans to buy your own Galaxy S8, have in mind that you will be having McAfee security software. There are also many other apps to download from the Google Play Store, and many of them offer system security as well.