They can be over engineered at times (or spread across too many documents) but they're generally well thought out and clear

IETF specs tend to be less over engineered, not always for the better. They can sometimes be vague

ETSI is a complexity rabbit hole.
W3C are all over the place and so many of their specs are gigantic monsters these days.
OASIS is... I hope you like Enterprise XML.
ISO is ok but they're behind a paywall.
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