You claim that the argument from a security expert is FUD even though several other experts agree with it. Alright, prove your counter argument. Write a quick AppArmor policy that covers Chrome comprehensively. If it is really as easy as you claim, then it shouldn't any problem, right? Let's deal with reality. SELinux policies are complex because security is complex and if the alternative was so easy, why doesn't it have any developers like you admit yourself?