When Dynamic events were introduced to the MMO world, they were a direct challenger to the old system of long quest logs and fetch tasks.

The key feature was the lack of overhead and commitment. You didn't need to be in a group. You didn't have to talk to any NPCs. It was just emergent content you participated in and moved on.

That has been the case for most of the FATEs in FFXIV. But I've been noticing a growing trend starting with FFXIII where these dynamic events are tied into progressive content.

FATEs are no longer emergent once you're forced to talk to NPCs and go to specific location to wait for them. They're no longer dynamic when you have to participate in order to progress. Putting them in quests regresses the creation of dynamic events.

tl;dr - Wrapping a quest around a FATE defeats the purpose and design of a FATE.