Perhaps I'm being overly cynical, but my impression was that high-profile Congressional hearings are mostly a form of political theater.
That, of course, is the problem with these open testimony sessions. Legislators get 5 minutes to pursue random agendas, and everyone knows that the sole purpose of the enterprise is to generate sound bites for people to argue about later on. The real fact-finding is done in writing, and by staffers, not legislators themselves.
The real hearing of Mr. Hughes: https://www.youtube.com/watch?v=GDkTkpoyfL0
I'd be very surprised if Tim Cook lied in his testimony. Politicians seem to have a major problem with big tech,. They just don't understand any of this and hopefully they don't make the same mistakes they made with Bell, that basically fragmented the OS stack and caused more problems than it solved.
When did Cook lie about it to Congress?