My only fear is how they will make the adaptations by number of episodes. Because Japanese studios are accustomed to adapting manga, which have between 17 ~ 50 pages per chapter, ToG has almost twice that amount per chapter, being abnormal even in the manhwas.
If they do what MadHouse did with HxH it would be perfect, the 1st season has a closed ending and a great hook, they don't need to go out and modify the original material. In the end, my biggest fear is that they will start using the material that the SIU disseminates in the notes of his blog, we know that given the time, a lot has changed and some facts cited by him over time have become obsolete, although most of the information is more curiosities that do not interfere so much in the story, some may end up leaving viewers confused, like the story of the first princess Arie or there is only one princess Zahard as a direct descendant of an FH or just 3 princesses from the 10 families.
I think they will do everything to be a success, so they will not shy away from the original material, it is clear that the Japanese market is saturated and the Korean only grows both in Asia and here in the West, it is not for nothing that we will have simultaneous release in 3 different places and apparently Crunchyroll is involved in the production too, ReLife that was paid for by them had a great adaptation to my view. In short, if they want to take over the animation market in Manhwa before China does, they will have to do a good job.