I think the term “functional training” offers a brand name to exercise that really helps sell fitness to folks who have no intention on joining a gym and lifting like hardcore lifters. The term itself allows the flexibility to applied to every single person despite the numerous goals they may have.
That being it is at the very essence for which people hire trainers. Anyone who buys personal fitness services is asking for exercises and workouts designed for what they do and who they are. That is what functional fitness is.
hope this helps,