You're saying bioware does this???
They have and still do, just because ME3 ended horribly doesn't change the fact that they tried and continue to do it as evidenced by Inquisition. First, just because the ending of ME3 negated everything you did before doesn't mean that the entire time before that your choices had an effect on ME3. This included who was alive, which affected how many party members you actually had available, as well as everything to do with both the Tuchanka and Rannoch mission arcs.
But, let's talk about the more recent example of DA: Inquisition. Here are just a few decisions that carry over and are shown within the game (DAI SPOILERS!!!):
-Whether or not the Hero of Ferelden is alive. This allows for numerous dialogue discussions about him and allows for a War Table mission to contact him.
-Whether the Hero slept with Morrigan and/or went with her through the Eluvian. The game accounts for these many variables such that Morrigan either had her kid with Alistair, Loghain, or the Hero. And, further whether she is essentially married to the Hero or lived apart from whichever lover. The game further adds conversations between Morrigan and whichever partner if you the Hero didn't sleep with her.
-Whether Alistair is King or not. Alistair shows up as King in the Redcliffe/Mage quest and proceeds to have several War Table missions afterwards if the player made him King in Origins. If he's not King and alive from Origins then he is the Greywarden the player meets with and travels with for the whole Adamant Fortress plot line.
-Whether Loghain was killed or not. The same as above, if Loghain was kept alive in Origins he becomes the Grey Warden the player contacts and travels with for the whole Adamant Fortress/Grey Warden plot line.
The Adamant Fortress/Grey Warden plot is pretty impressive as it essentially calls for three separate voice actors and full in-game models to account for all the player's world-states due to Origins. This also includes separate dialogue between the characters (Alistair, Loghain, Stroud) to explain what they've been up to. I could go on.
So, tell me what developer does that kind of reactivity? Not even god-tier Witcher 3 gave two fiddles about what you did in the past games. Why is Roche fighting Redania? Last I checked he had joined up with Redania in TW2 after I have Foltest's bastards to Radovib after having previously married Foltest's incest born daughter to him in TW1.