modern late night is an unfunny mix of Infomercial and Propaganda
The humor has been replaced with one sided political attacks that make the hosts sound like a branch of the Democratic party.
The interviews are scripted infomercials for whatever project the celebrity is involved in. Back in the day Dean Martin or whoever would come on the show and talk about whatever project they were involved in and the conversation would veer off into comedy. Today the interviewees are reading PR notes off a cue card