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Because you’re retarded.
Every main series reveal at worlds is tied to revealing a brand new Pokemon, item, ability and/or signature move that will affect competitive play, exclusively for games that feature online competitive play that will be featured at the next Worlds.
>2013: Mega Kangaskhan with Parental Bond
>2014: nothing (gamescom had an ORAS trailer a day before anyway)
>2015: nothing
>2016: Crabrawler
>2017: Kommo-o’s new Z-Move Clangorous Soulblaze
>2018: nothing
>2019: Room Service, Eject Pack, G-Weezing with Neutralizing Gas, Mirror Armor, Breaking Swipe, more details on Dynamax
>2020: no worlds lol
>2021: no worlds lol
>2022: Cyclizar with Shed Tail, Mirror Herb, Loaded Dice, Tera Blast
>2023: Psychic Noise, Upper Hand, Thunderclap, Tachyon Cutter, Stellar Tera Type teased
They were never going to reveal anything involving a single player game at Worlds, and would especially not feature a first-look trailer. That has never happened and is not likely to ever happen.