The entire concept of final fantasy has always been about group play. Taking a group and destroying giant monsters for various world saving reasons. I also think it's a bit inaccurate to refer to the archetypes as a limiting factor. By setting the specific roles, it allows them to create a solid structure to work around and iterate upon. So yes, every job should be a dps or a tank or a healer but that doesn't mean they shouldn't try new and interesting ways to change up the moment to moment gameplay to make it fun and engaging. I honestly don't think the very clear role and archetype structure is a weakness.
