There has ALWAYS been a lack of backstory to side quests in Bioware games. There are exceptions to the rule where some quests are better thought out than others. The Orzammar zone was the exception as it had more thoughtful and explained quests than others but for the most part you got nothing. Love letters, places of power, conscripts all gave you zero background then i need X get me X. Lothering was nothing but fetch quests with two companion introductions. With as much exposition as you got in the I need ram meat to feed people is the same as I need poison glans to poison my traps. People have selective memory about DA:O, it is cognitive bias known as nostalgic bias.
I literally just finished getting done with DA:Origins as I had been given the ultimate edition or whatever, and I think I see how people forget the issues with the sidequests in Dragon Age Origins versus Inquisition. The issue is that in Origins, the quests were considerably closer together, meaning that you could walk by and knock out 2 or 3 of them in a circle around town without even really trying as opposed to Inquisition where they seemed to be designed with some rather deranged design. Take the Hinterlands for instance, you're walking around perfectly fine doing the quest and then suddenly, the game just launches a dragon at you which you have no way of realistically fighting when you first run into it which basically tells you to go another way, and then there's a fade rift where you can possibly beat it depending on what items you've brought along and party arrangements, but is a struggle at best.
The worst part? Nothing is even close to the enemy's relative strength right there unless you sneak passed it where the enemies are even stronger after that (why!?). Quests seem to have random arbitrary lock offs at moments like Varric's lyrium quest where you simply CANNOT finish it until a certain point in the main game for no clearly explained reason from a design perspective, and no one mentions that you CAN'T finish it which can leave you foolishly jumping around like an idiot for a few moments (possibly hours). There's also the fact that sidequests in Origins are never forced on you while in Inquisition, they are. Sure, you can argue that you don't have to do many, or argue that you can circumvent some by buying the scrolls to give you some power, but it's still a bit more obnoxious about it in Inquisition than it was in Origins, which is insane, because Origins was the first in a series, and Inquisition is the third. There are definite problems in both, but Inquisitions jut out more obviously which is why people point them out. There's also the fact that maps are much, MUCH larger, so transverses across the maps are considerably longer than Origins.
In this sense, it's easy to see how someone would say "the sidequests are better in Origins." It's because they are easier to do. In Inquisition, it's almost like Bioware DOESN'T want me to do the sidequests because of how inconvenient they are. I mean, they really put more emphasis on SIDE in the word "sidequest" in Inquisition. 