Answer:
Romanesque architecture is characterized by its massive quality, thick walls, round arches, sturdy pillars, barrel vaults, large towers, and decorative arcading.
The buildings of the Romanesque period were meant to be huge and awe-inspiring as they were created to house religious reliquaries and allow hundreds or even thousands of pilgrims to view them.
Therefore, it was necessary to increase the size of Romanesque churches to accommodate the numerous monks and priests, as well as the pilgrims who came to view saints' relics.
Additionally, the increase in popularity of pilgrimage in the years around 1000 led to the construction or enlargement of many pilgrimage churches in the Romanesque style.
In summary, the size of Romanesque churches needed to be increased to accommodate the large number of pilgrims who came to view saints' relics and to reflect the religious fervor of the time.