The FBI just wants to throw you in jail. What do they publish? Lists of people they want to throw in jail. Anything that stands in their way of throwing you in jail is bad, including your encrypted phone.
It was notable that there was a very brief "scandal" that MI5 had found evidence of child molestation but ignored it because they'd only found it via their ability to ignore due process in the name of national security and therefore since the information wasn't a national security issue it was filed under "not usable".
Cooler heads pointed out repeatedly that that was how it had to work to preserve due process, and it didn't stay news for long; this was, to me, the correct outcome.
(of course GCHQ is a whole different kettle of fish)
The FBI should have been reorganised along with the secret service and BATF after hoover died into two organisations one doing MI5 s role and one as a federal police force.
Their is a very good reason that SHA3 is not designed by the NSA.
Yes you can learn from them, both from their published stuff and even more from how they attacked people.