Don't disagree that if the headliners don't apeal to you it's not the best. Pvris/Kneecap does look a bit weak on paper but I'd say it's comparable to The Chats/Bob Vylan last year. TBS may be past their best but I think with Coheed and Cambria on the same day its okay. Any announcement was going to be dissapointing if you were expecting Biffy and Deftones.
Let's not forget that the social threads were requesting the likes of Chappell Roan & Sabrina Carpenter the day after Primavera came to an end this year. If you look at the comments on the Stereogum site they are very positive, and echoing what other people have said here, I think we'll appreciate how deep this line up goes when compared with other festivals throughout next year. The headliners might mirror something like Coachella, but their undercard would never be this creative or diverse