Committees were invented by doughnut manufacturers as a way to move product.
But seriously, for a lot of complicated organizations where no one person knows all of the details of a product or process, it helps to have experts collaborate (sometimes, in as light a way as possible) to make sure that each discipline has its needs met.
For example, in my company’s product line we need to be concerned with the ASME Boiler and Pressure Vessel Code as well as its equivalent in other countries, export and import restrictions in terms of what we can send from the US and what other countries will accept, and from where, transport requirements in the source and destination country as well as ocean shipping and insurance, bonded warehouse and customs clearance requirements, legal tax avoidance, finance and letters of credit, scheduling, sourcing products worldwide in accordance with complicated contract requirements, short and long term storage requirements, erection of the equipment after delivery and site storage, startup and commissioning and warranty coverage per the contract. And we need to do that on every one of several thousand components making up the entire delivered product over a four or five-year engineering, procurement, delivery and erection span.