Vometia makes a good point. The end-game is something that is supposed to inspire us to start a new character and replay the game, not compel us to play something else instead.
I've played many games over the decades, and two things stand out as my all-time least favorite features:
1. Escort quests
2. Time limits
Bonus points if the escort quest is also on a timer.
Oblivion had a time limit in the battle for Bruma, but I was able to mod that crap out of the game and so the game remains a favorite. I much prefer games that imply a time limit (aka urgency), but never enforce it. I play games to relax after a long day at work, not to be hounded with yet more deadlines. :P
This plus 1000000000. I haven't played FoV yet. But from other games, I LOATHE escort quests above all else. Main reason being is they make no sense. Why on earth would you send big, gigantic targets through enemy territory without clearing the way first? I may end up just setting the difficulty slider to easy for that quest. Same with time limits. Another thing I really can't stand is having to protect something stationary like a building.