The quality has definitely gotten worse to say the least but the costs are rising if anything so no surprise of some profits. I have had broken pieces included in 2 sets bought in 2 different shops towards the end of last year. One of them a unique piece that cannot be replaced easily.
The thing is I never had a broken piece in the hundreds of sets I got in the 1980s and 90s. I am certain they have cut back on the quality control aspect for cost savings. I have also noticed that some bricks in the sets last year had imperfections never seen previously.
Anyway, to me it is not a huge big deal as I don't make their official sets but make my own Mocs as I think the quality of their designs is...
However, if I was a young kid who wanted to have that airport correctly made as the instructions show, I might be a bit p....d off.