Each generation has ups and downs compared to those that came before it. In recent times, short tik toks do seem to be detrimental by leading the brain to focus on receiving constant doses of dopamine instead of focusing on something like a book which requires much more focus.
I'm not saying the sky is falling, but it's different from the introduction of newspapers and radio and TV and even gaming. In the 60s I guess you'd watch a program with your family at night (like Andy Griffith). You weren't raised on monetized YouTube ads and then watching Tiktok all day. I don't think they're adapting at all, but not learning the necessary skills to hold a job. This isn't all Gen Z, but a lot have trouble focusing for extended periods of time, not to mention challenges with communication and socializing.