I'm sorry if this comes across as harsh, but Square Enix can't win - originally Soken was going to do exactly as you wished and have a unique track playing on the title screen (part of a track listed on the OST album as Serving the Light), but for various reasons during the Alpha test players complained en masse about this and demanded it be changed to a 'traditional' FF track, and hence Soken accepted the feedback and gave us that lovely slow rendition of the Prelude instead.

FFXIV is a FF game - and a FF game that references and celebrates all the FF games that came before it - so the iconic Prelude is definitely fitting (and the final word is the Prelude also was used as the main title music for version 1.0 as well so there's that link too).