Maybe, but it doesn't matter. It's just an ongoing crusade of mine to pinpoint fanon versus dialogue-supported "canon" whenever I have too much free time on my hands. Anyway, whomever posted it on MA probably posts here, too. No matter.
So - Riker finally accepted a posting on Titan
. Why did he give up the dream of commanding an Enterprise
? Official decree from above - "take a ship or you're out!" - or a decision to move on combined with a ship that he fancied as equivalent to an Enterprise