The short answer
It is useful for concealing services, ducting and lighting, but it costs height and money — skip it where neither is needed.
A false ceiling hides air-conditioning ducts, wiring and plumbing runs and allows recessed lighting. In rooms with exposed structure or no services, it adds cost and lowers headroom for little benefit.
If you use one, plan access panels for valves and filters. Serviceability matters more than a perfectly seamless surface.
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