PhD system and duration: 5 years with 3 years planning - isn't it too long and risking obsolescence on the go? What about contributing to many projects and not just one "personal" thesis?

This is a continuation of the 2008 article: A Start-up or a PhD? - that is the question https://artificial-mind.blogspot.com/2008/08/start-up-or-phd-that-is-question.htmlThe question-essay was asked to the comments section of a Q&A session video for clarification of the PhD program of  (...) [but deleted by the channel owner soon after]Is it possible to plan your research for 3 years in a PhD program and what if your plan gets obsolete which is highly likely in the current speed of innovation and competition? Aren't...

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