Answer:
Most Romanesque churches were related to monasteries. Remember that it was in the libraries of these monasteries that were the majority of Roman knowledge, which will enable the construction of certain buildings.
There were no big cities yet, so most of these churches were in the countryside and needed people to keep them and to run the service
Exterior x Interior: simple, and interior with paintings and reliefs. It was a reflection of the good man, who was to cultivate his soul, his inner self, not his outer, giving temptation and sin a chance!