People really don't seem to get that regardless of whatever feelings they have about Daniel, he's in Dubai because of Louis. Think of him however you like but he said it plainly, "hire a transcriber. I don't do puff portraiture anymore". Louis had the complete option of simply not contacting him, simply letting Daniel die in his own oblivion and irrelevance that even Daniel himself points out.

"Legacy? That's for board members and assholes in loafers". Armand doesn't seem to want Daniel in Dubai either because of what Louis may want Daniel to do (publish a book, risk other vampires to come after him). So for all the questioning and sarcasm Daniel throws at Louis, he's still an old man in his 70s with a developing disability, locked in a penthouse apartment with no way out with two old vampires who are more than capable of tearing him to shreds. That's his choice but it's also Louis' choice to even have him there. If Louis didn't want the sarcasm, the bitterness, the relentless questioning and invalidation of his (blatantly constructed) narrative, he wouldn't have taken to asking Daniel to interview him again. If this was solely about Armand, Louis' life story has absolutely zero to do with whatever went down with Armand and Daniel. Louis has followed Daniel's work, has read his autobiography. He knows Daniel's work even has a motif of unreliable memory that becomes obscured with time (or another vampire's mind-bending ability). Again, Daniel is in Dubai because of Louis. No one is demanding he continue an interview with an old mortal man whom he could just as easily kill with no one questioning anyone else about it afterwards. Daniel is of no importance to even his own family now, yet Louis still wants their interview to continue. Frankly for all of Daniel's dismissive comments, Louis has had every opportunity and chance to kill him already or shut him up, have his mind wiped and send him home. The fact that he doesn't is more glaring than anything else.