Why is Titan’s potential for water-based life considered severely diminished compared to Enceladus based on recent structural analyses?

Internal structure and thermal history analyses suggest a deep, liquid water ocean might not form or be maintained long-term

While Titan is chemically fascinating with its abundant surface organic chemistry and Earth-like features (rivers, lakes), the central question for water-based life centers on its deep interior ocean, which remains uncertain. Recent research focusing on Titan's internal structure and its thermal evolution indicates that the necessary conditions for the creation or sustained maintenance of a large, deep liquid water ocean beneath its icy crust might be absent. If the internal structure does not support this essential solvent interacting with rock, Titan's potential for supporting life as understood on Earth—which requires liquid water—is significantly lowered relative to Enceladus, which shows clear evidence of such an ocean.