The talk at the FOSDEM conference in 2023 was about the importance of prioritizing integrations in open source software development. The speaker discussed their experience integrating OpenProject with NextCloud and highlighted the challenges and lessons learned throughout the process. They emphasized the need for core developers to actively participate in integration projects to better understand the issues users face. The speaker also touched on the architectural aspects of the integration and discussed various problems encountered, such as cross-site request issues and the lack of certain APIs. They concluded by stating that integrations make applications stronger and encouraged developers to prioritize them.