Capabilities can be similar but having a field workforce of 50 and 25 pieces of equipment is very different than having 500 people and 250 pieces of equipment in terms of the quantity and size of projects that can be pursued and built.
Capacity is one of the 5 Cs of Credit and will be a factor in both your bonding capacity and operating line-of-credit (LOC). Capacity is part of the specs of every vehicle and piece of equipment. Capacity at the craft level is pretty well defined by the units used in estimating.
Capacity in management, coordination, administrative, and other staff roles is typically much more difficult to see, especially when the role is responsible for a wide range of tasks.