If you just use Windows alone and no 3rd-party security software what conflicts are you expecting? If conflict is with non-security software then using Windows + 3rd-party security software will also have conflict too, right?Simple doesn't mean lesser. It's to one own's liking. I have many systems at home, but I don't use all of them. I just apply the suitable security suite for my system in order for my family to use it safely and above all "EASE OF USE" without any concern of programs conflict. That's my simplicity.
FYI, the only laptop that is not on any 3rd party software is my spare laptop, in case any of my system is broken.
And, no I don't buy security software for spare laptop. Cost is a concern too.