This makes no sense to me... Greenfield projects have problems that legacy projects don't (What language to use, what framework to use, where/how to deploy, etc.), and vice versa (How do I design my feature with the existing limitations of the system in mind, do I need to to redesign a part of the existing system to get it to work, etc.).
None of that has anything to do with "Time thinking about the problem", nor does either one imply that its questions are easier or harder to answer in all scenarios. They're just very different questions, but some devs prefer dealing with the issues a greenfield project presents.
None of that has anything to do with "Time thinking about the problem", nor does either one imply that its questions are easier or harder to answer in all scenarios. They're just very different questions, but some devs prefer dealing with the issues a greenfield project presents.