Flex hours experiment at my company flopped

Management announced we could do 7-3 or 10-6 instead of 9-5. Seemed perfect! I picked 7-3 so I could be there when kids get home. Within a month they "encouraged" us back to normal hours because it "hurt collaboration" (translation: some managers couldn't handle not seeing us there at 9am). Infuriating. It's 2024 and we're still doing this theater about being in an office.