Not everyone wishes their pond was bigger. It depends.
A bigger pond looks better BUT- A bigger pond means proportionally more cost and work in maintaining weed problems that eventually occurs depending on nutrient inputs. Most owners use chemicals for weed control so more cost and some pond chemicals are pretty expensive per acre of water. Larger ponds mean more harvest of plants and or fish meaning more man hours doing the effort. Smaller ponds are easier to renovate with the fish community needs to be killed off and restarted. Smaller pond area allows it easier and quicker to drain whenever needed. Proper management is not provided to some large ponds due to cost and effort required. Heavily feeding fish causes more rapid eutrophication which causes plant and water quality concerns, thus all ponds eventually need to be rebuilt or dug deeper or deepening the edges or shoreline. The larger the pond the more expense in rebuilding and someone has to deal with that problem. Larger is not better in that situation.

Large fish can be raised when done properly in small water.