If an alien species possessed advanced technology that allowed them to travel the universe in a matter of minutes, it is conceivable that they might not need to reside on a single planet permanently. There could be several possible reasons why they might choose to do so:
Resource Gathering: Despite their advanced technology, the alien species might still rely on certain resources or raw materials that are best found or harvested on specific planets. They could establish bases or settlements on these planets to extract and utilize those resources efficiently.
Cultural or Historical Significance: Certain planets might hold cultural or historical significance for the alien species. They could have ancestral ties to a particular planet or consider it a sacred or important place in their civilization. Living on that planet could hold symbolic or sentimental value for them.
Environmental Adaptation: Each planet might have unique environmental conditions, such as gravity, atmosphere, or climate, that require specialized adaptations. While the advanced alien species could potentially modify their bodies or technology to adapt to any environment, they might choose to settle on planets where they can thrive without extensive modifications.
Research and Exploration: Despite their ability to travel quickly across the universe, the alien species might still be interested in scientific research and exploration. They could establish scientific outposts or research facilities on different planets to study various phenomena, ecosystems, or civilizations.
Collaboration and Cooperation: Living on one planet could facilitate coordination, communication, and collaboration within their own species. Having a central hub or home base might be beneficial for governance, cultural exchange, and coordination of their interstellar activities.
It's important to remember that these reasons are speculative and based on our current understanding of human motivations and requirements. An advanced alien species might have completely different priorities, needs, and preferences that we cannot currently fathom. The possibilities and motivations of extraterrestrial civilizations are still largely unknown and subject to imagination and speculation.