I'm not 'making suggestions
I'm referring to your apparent concern that pilots are "taught to rely on" the only indication that seems to be available on most types.
As far as briefings on the progress of investigations, the known facts, and the general lines of enquiry being pursued are concerned, usually no time at all.
The information in the CVR and the FDR, and all other details of what the aeroplane and the crew actually DID, is usually published as soon as it is available.
Doesn't that depend greatly on where the accident takes place and who's conducting the investigation? Some appear to be conviced there's a "cover-up" regarding the BA038 accident simply because no definite cause has been announced, even though the crew survived and the data recorders were recovered. I'm sure you remember the Armavia accident, when there was a flood of information released early on, none of it reliable.