The General Assembly states that it is in the public interest to provide for the development of lands in a planned manner. The development of lands in a planned manner is necessary to: obtain economic and environmental benefits; relieve economic pressures that result from the assessment of planned development land at levels inconsistent with planned development; aid the assembly of land for planned development land; facilitate cooperation among landowners; and permit holding of planned development land in an undeveloped status for orderly and staged improvement, particularly for the development of new communities.