Gil-Galad in lore is one of the most influential elves in the entire second age, it was he who first noticed the return of evil things to the world, it was he who first engaged with the numenoreans for aid, and it was him who led the elves of the west to prosperity and general safety, but being current year and the types of people in charge of this project, we can't have a strong white male lead being the good guy, unless they are a gay or trans person in which case exceptions get made i suppose, all in all the last high king of the noldor got shafted in this production due to the aforementioned biases of the writers/showrunners.