These two statements assume that everyone in the game development industry uses third-party engines for creating games. By this logic, I guess we all should forget programming and software development beyond anything trivial and start using Unity3D from now on... On the other hand, I think you don't need any third-party engines to make even the largest game project, which in this sense is no different than any other software project out there. Therefore, the existence of third-party engines and libraries do benefit the game development community, but they are not essential to consider Delphi and FPC/Lazarus as viable platforms for commercial development.
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