>>713436249because HDTF was borderline unplayable when it came out. it was infested with game-breaking bugs that'd would make certain events not trigger, or outright destroy your save file. not to mention all the visual gliches like missing textures.
the game also lacked a proper tutorial for the new mechanics and some buttons were binded incorrectly.
EZ:2 was at least playable, and from a technical standpoint, more impressive that HDTF.
Oh and EZ:2 is fucking free, that helped too.