Du musst den gesamten Artikel richtig lesen. Das sind alles nur Hilfslösungen, da eine Konvertierung immer einen Performanceverlust nach sich zieht:
Benefits for end users. Preinstallation of NTFS offers many end-user benefits related to functionality, security, stability, availability, reliability, and performance
In addition to delivering the benefits listed here for end users, preinstalling systems with NTFS offers these benefits for the system manufacturer
New tools reduce manufacturing time and optimize performance. With Windows XP, Microsoft is providing new manufacturing tools described earlier in this article that will help minimize manufacturing time for preinstalling Windows and maximize the Windows preload performance for end users.
New Windows PE-based imaging tools are available that support NTFS. Third-party imaging utilities are being converted to the Windows Preinstallation Environment, replacing old MS-DOS-based tools. However, some MS-DOS-based versions do now support NTFS
Das bedeutet nichts anderes, als das MS dringendst auch bei einem Vorinstallierten System ("pre-installed") die Verwendung von NTFS empfiehlt, und zwar ohne Umwege.