Part of the answer is in the next sentence:

>And because nobody seems to care about these issues

The word "quality" is very subjective in this case. Perhaps the driver already did everything Qualcomm needed it to do. Maybe the code isn't perfect, but if it's working and money is being made... "if it ain't broke, don't fix it". I'm sure a non-trival amount of people on HN have worked in less-than-good codebases, but finite resources & politics kinda prevents you from cleaning it all up with weeks of re-factoring and testing. I know I've seen this.