Even using my examples of KOTOR and ME, comparing them to (relatively) modern counterparts, Jedi Survivor and Andromeda, you can see that the storytelling has taken a back seat to the open world. ME 1-3 were all very tight corridor cover shooters, going from fully constructed combat environment to another, while Andromeda tried to shoehorn in survival crafting and exploration. KOTOR has more deep RPG mechanics and overall a better story than Jedi Survivor, and I would agree it's because the focus changed on providing sprawling open worlds over more bespoke environments. I would also say that the combat in Andromeda and Jedi Survivor are superior to their older counterparts, but at the loss of other things.