Agreed. As an example of that, Meta's kept its research org, FAIR, still doing fundamental research. Research orgs are great at demos, but actual productionalization takes a different mindset.
FAIR is considerably downscaled from what it was before, in eg 2022.
Fun anecdote: some folks from FAIR reached out to a friend, asked her to apply, and then rejected her without an interview!
Facebook's recruiting funnel is super broken after they fired a ton of their HR teams
Referrals are vetted by global teams who are just checking boxes - it's very common to have to reach out to the recruiter for the role directly to resurrect a rejected referral.