Damn accurate. They do work to the edge of the SNR of the vacuum of space. But the vacuum of space is damn accurate. Physicists, and the vacuum, minimize phase imblance, and they both operate to the limit in todays world.
Hence, I hesitate to look much closer to the red shift, because I think both sets of vacuum are near perfection. I am not close enough to decide.
And the forces of gravity and beyond. The separation of groups is vanishingly small in quantum terms. It is hard, maybe impossible for either us or the vacuum to distinguish the continuous from the quantum view.
The lifetime of a proton? Amazingly accurate to pack the thing, and amazingly accurate to estimate its decay rate.
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