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The short answer is that the teams are so big because they feel a need to be that size.The rules have become so prescriptive that there are no easily found advantages and armies of people are seeking tiny gains in every aspect of the cars.The greater the number of people looking,the better the chance that a small gain may be identified.The increasingly sophisticated engineering requires yet more by way of assembly jigs,all of which have to be manufactured and inspected prior to use and then components must undergo an amount of durability testing because of the penalties for swapping major components.All of these aspects of building and running cars are carried out by humans.
Its a bit too late now to remove some of the restrictions and hope the creative minds can devise ways to create faster cars as the mindset has changed from innovating to refining ideas,many of which originate with the opposition.The other aspect of this change is that team management is now a process of meetings and committees rather than the proprietor sticking his head round the workshop door and saying "I've got an idea!".
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