Whatever the pasta is now, it cooks quite differently. You'll get softer noodles much quicker, and will congeal into a blob unlike the old recipe.
Additionally the water gets extra starchy with the new recipe.
I haven't seen it mentioned anywhere else but the quantity per box has decreased as well. Special shapes came in smaller weights, but now even the regular box does too.
That is the specific problem I get now. The powdered sauce-stuff just never turns into a sauce but instead likes to stay in these horrid blobs full of unreconstituted powder, while half the noodles aren't coated. When it happens three times in a row, with three separate batches/box date codes and different milk/butter, I can cook your competitor's product with no issues, and I used to be able to cook yours so I know I'm not just being dense, that means it's your fault and you're out. Forever. Having real alternatives means I have no mercy for enshittification.
I should probably also note that this is specifically the "Thick and Creamy" variant because the " 'Original' Flavor" got banned from the household a long time ago for somehow being inferior to store-brand generic. Kraft just really does not want our business.