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You have a point, but in reality this isn’t exactly what instances advertise, so especially users who aren’t already in the loop are unaware of what they are not seeing. Even more so because defederation-heavy instances also treat discussions on the matter as off-topic or worse, so those users are actively prevented from making an informed decision.

3 grams maybe.

Hasn’t been my experience with a correct DKIM & DMARC setup.

Yep, I do it in every format. Just kept it short for readability.

No because it’s the global format that typically uses periods.

D.M.Y (normal)
Y-M-D (superior)
M/D/Y (mental illness)

Mixing up the formats and denominators makes this mess even worse.

You’re directly contradicting yourself in the first paragraph, and your statements on Trotsky’s beliefs are far removed from anything we actually know about the man.