Is it true for everyone that deodorant is required for good hygiene?

Adults need it: Listen. Why are you asking? I'm not saying this is right or wrong, but if you don't manage your body odor -- and almost all adults have some -- you'll find yourself without a job and they won't tell you the real reason you were dismissed. Not caring for yourself and showing consideration for others at this basic level is a terrible social and professional liability. Be savvy and do what u need to.