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My guess would be that whether a muzzle device is finely machined has little bearing on accuracy, but the weight and length would allow a device to act like a tuner, effectively changing the weight and length of the barrel.
I've never found a way to predict how any specific device will influence accuracy other than to try it. I don't have a ton of experience in this, but I've only struck muzzle device gold a couple of times while it must be nearly a dozen times I've seen a degradation in accuracy.
I've a Dez Arms 20" pencil barrel with an old Levang linear comp that is amongst my most accurate centerfire ARs. For rimfire, I did once find a brake that both detectably reduced recoil and tightened groups a bit, but the reliable answer for those is a plain thread protector.
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