Actually, it's so mature that it breaks exactly when the manufacturers want it to - after warranty.

Just like you can optimise a 3D-printed shelf to have a shape that's almost fully load-bearing and thus uses less material, you can produce a part that can be stressed a certain number of times before it breaks.

This practice crossed some kind of threshold in the latter half of the last decade, because every manufacturer is now in on it.

So cars are indeed "getting worse", because the margins of reliability are now much thinner than e.g. 20 years ago.