I updated to Win 10 day it came out, all my company computers use it, and as far as I know, sakes as my friends. No problems. Microsoft has a vested interest to make sure their product is secure, so whether complete or not, it will likely be good enough. Apple likewise but I suspect less because they have not been target, nor as many around the world. Keep your updates current and skip the worry. BTW, while I have tried Norton/Symantec and others, I always yank them as what Microstructure builds in is good enough.
And I hate Safari autocorrect on an iPad. At least it didn’t change the wording to grossly.