Why did Gothic and Romanesque form in the same era?

The Romanesque style was formed in Europe under the influence of constant feudal wars. For this reason, most of the large structures were built with the expectation of a siege, that is, they were a kind of fortifications. Thus, monasteries, castles, palaces, etc. were built. But over time, the need for massive buildings faded into the background. In this connection, there is a Gothic. Gothic cathedrals and temples were famous for their elevation and beauty, which strikingly distinguished them from romantic architecture.