Right, I'm surprised to be reading justifications that amount to "it's been deployed for several years now, so we think it's OK", rather than "here's a report from a researcher who's tested how it behaves on a wide range of systems".

I don't know enough to count myself as a "skeptic", but if I try to apply the test "suppose in ten years time you're reading a news report describing how this feature failed to work as intended; is it easy to imagine the sort of things it could be saying?", the jitter dance doesn't do terribly well.

(I'm imagining something like the case where large numbers of consumer routers ended up generating the same secret on first boot, or perhaps large numbers of virtual machines. And there seem to be lots of ways to imagine a processor that had surprisingly little jitter: maybe an x86 emulator for Arm, or a "Big/Little/Tiny" processor, or "Spectre is really truly absolutely mitigated now we promise".)