Sessions answered your question today. BTW he is not some grandstanding A-hole constantly before the cameras announcing what he is going to do. He just does it.
Presumably when you bake a cake you expect it to be ready in five minutes.
Congress can not effectively operate without hearings both to produce laws and to handle investigations of those subjects important to the nation. Many are after the fact which is also unavoidable.
One of the more important hearings were those into organized crime in the late fifties which revealed concert evidence that there was a Mafia and which led to the arrest, conviction and imprisonment of many OC figures. They also put JFK into the spotlight resulting in his election, after which he and RFK went after the Mob in a spectacular fashion. Sadly that led to his death.
It is even more clear that you don’t understand the workings and importance of the Congressional hearing procedure. Often they only have educational value which you, apparently, disdain.
Look here dumbsob, I wouldn't watch Congressional committee hearings if I didn't find them educational, I mean, why else would I punish myself by listening to Elijah Cummins. Every time I see him and listen to his disgusting gurgling I want to put my foot through the television. That's one of the reasons I'm sick of the hearings. So we watch the hearings and get educated, find out just how treasonous these people are, only to see NOTHING come from it. How can you accuse me of being uneducated on the process when I'm watching the damn committee hearings all the time. Do you watch them? All these bastards lie under oath and get away with it over and over again. Take Holder for example, in contempt of congress and kept his job. And don't try to tell me it's because this happened under the Obama administration. Comey has lied under oath since Trump took office, I just watched the FEMA head and the head of CB&I lie to the Oversight Committee. Nothing happens in these hearings except for showing us just how crooked these people are. Nothing happens to them legally. I'm done with you.