To me, it wasn't so much about each DLC making a huge impact or the story being amazing. It was more about already playing the game to death and then gaining access to more content to explore. Kind of like eating a delicious cake, still being hungry, and then finding another slice of that cake that was sitting out all day.
I would argue that all the fo3 and oblivion DLC were decent. Some obviously better than others, but they weren't just soulless cash grabs. They had effort go into them, and were fairly new into the DLC space so some trial and error is to be expected. They had a pretty good amount of content for the price relative to the base game, compared to the starfield DLC/ current AAA norms.
It could be a matter of storing non-text information in an uncompressed text format. Kind of like how all files are base 0s and 1s in assembly, other files could be "logged" as massive text versions instead of their original compressed file type.
I had a job where I made 20+ calls per day. I worked there for almost 2 years, and hated it just as much the day i quit as the day i started. They weren't even particularly difficult calls, just processing orders and looking up part numbers.
That being said now I sit in zoom meetings which don't seem that different but I find them 100x less stressful.
Damn, I love path of exile