One of the things that still stands out in my mind for the BG saga and all the old Infinity games, was just the steady clip at which its expansions and sequel were released.
For the time, and even by todays standards, they cranked those games out in what felt like a new entry like every six months for couple years running.
Yes, even as late as NWN2, once the engine was built, the subsequent stories came out quite quickly.
Obviously there have been changes in the last 15 years! I think it's partly the asset quality has increased so much that they are more time consuming to produce, partly the monetisation of engines is achieved through less substantial expanded content ( DLC rather than story episodes ), and partly engines seem to need updating more often to satisfy the current player base.
I have to say that I am more a fan of expansion stories than of the more common drip-drip DLC. The Witcher 3 "Blood and Wine" , for example, shows that it is still possible to do a good job with expansion stories, but it is a rare exception.
