You are referring to the reports and analysis in Project Bluebook and other official UFO programs. Yet it is well-established that for the US and Britain and likely everyone else, the best and most provocative UFO reports are reported via a separate channel that remains secret. For example, the head of Project Bluebook, J. Alan Hynek, is said to have been quite annoyed at this, while Nick Pope, the UK’s former UFO reports analyst in their Ministry of Defense, has described credible reports, photos, and radar traces kept from him through high levels of classification that he was denied access to.
I don’t dismiss such reports. They are boundary layer control secret weapons.