Because Bethesda said so
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This update has long been in the works, I believe they mentioned this some time last year with the an eye to releasing it late 2023 or early 2024 but it got delayed. As for the impact of the New London, Bethesda isn't going to change their release schedule for a mod.
no, i couldnt have explained myself well in either point, i meant how do they know that it will break mods, and that if it would then the Mods of Fallout London would change their release date. I came into the thread just now to apologise, as the Mods of Fallout London have just now announced a delay as they wait to see how the update affects it. seems to say it will but only until the makers of Fallout Script Extender update their software.
Carter concluded the announcement with a reference to that classic Fallout line: “War. War never changes.” "As soon as we've fixed it, it'll drop," Carter said, "but yeah, Bethesda. Bethesda never changes."