Actually I think the opposite. Those quests are awesome after you finish the normal quests and just want to RP. They give us stuff to do after everything is over.
Exactly, I'm sure that's wha the design team had in mind. Very VERY few people are going to finish every single scripted quest in the game before beating the MQ, and those that do probably aren't even bothering with the MQ at all lol at least not with that character.
Random quests combined with the solid helping of scripted quests you didn't do before you beat the MQ will make for a fantastic post-main-story experience, something I think is severly lacking in most RPGs to date (only the Star Ocean series comes to mind when I think about any RPGs that actually still have some decently cool [censored] to do after you beat the game).