I think this article predates a drop in brick quality which happened in the last 5 years. I bought a number of small sets a few years ago and every single one of them had pieces that split up the side after very little use. This may have been around the time they were trying to use plant based plastics, or possibly having issues due to new factories, but I now have a perception that they are not as durable as they used to be 30 years ago.
I’m curious if this is reflected on bricklink prices. You’d probably have to be clever in how you do the analysis though.