[statictype]

Because at some point the volume of 'work' you process will be more than what a single CPU can handle.

I think of it like big corps vs startups. Startups may have more efficient engineers and development cycles and produce higher quality work because of the selectivity of their employees, but the sheer amount of work a big Corp can do is significantly more.

(Just an example, not saying big corps don't have talent - far from it)

When designing your system you need to decide which model it needs to follow. There are places for both.