YMMV. I have always had extremely pleasant, hassle-free, and fast support and warranty from Dell. It's not that their monitors or laptops fail more often, I've just been buying them for a decade.
[1] https://www.computinghistory.org.uk/det/54920/Dell-320LX/
Second only on the chart of “companies to never buy from” to HP.
There's no reasonable explanation aside from planned obsolescence.