User blog comment:Master Sima Yi/Assassinews 03-03-'13 — Assassin's Creed IV: Black Flag trailer and screenshots/@comment-5515807-20130306190549/@comment-4868246-20130306213151

I always detested full sync, although AC3 allows you to restart checkpoint instead of the entire mission it was still ristrictive (which is opposite to the foundation of AC). However, integrating them with the side missions only would be a brilliant idea, except for the timing objectives in secret tombs, that ruined the freedom to explore the beauty of the place :(