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Also, note that that's just software-type side channels. Hardware side channels exist that can be used on all systems, like fault injection. You can try to design against them, but there is a fundamental physical aspect to it. Side channels are hard to use, but have large payoff.
Yes, if your adversary has local access, you can make it harder for them, but you're always going to lose if they have unlimited time and/or money. And it's fucking hard to design for that.
Thankfully x86 is far, far, *far* away from being even remotely to the point where they have to care about that, because both major implementations of the architecture are a joke local-security-wise.
Yeah, side-channels remain an issue of low-hanging fruit. Sure, theres some gurantee that you can always make it work, which is useful, but it doesn't matter if there's an easier route, and there almost always is. Why did a tunnel when you could just use the open door.
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