Earlier quoted context omitted.
Are there other flat pack furniture brands? I did not know this. I had all IKEA up until I started replacing IKEA with already-built pieces from garage sales/ furniture stores/ family. Maybe I have just gotten unlucky, and fallen in the tail end of their defects.
In the UK and Ireland, Argos do it. Similar pricing to IKEA, dramatically worse quality.
There are (from searching) several supplies of cheap, flatpack furniture for landlords, which probably explains why half the properties I rented as a student had the same furniture, made of 5mm thick hardboard and bits of plastic. That stuff didn't even hold together properly when it was new, let alone a couple of years old.
Habitat should be decent quality. MFI used to be a major retailer of flat-pack stuff, but they went bankrupt in 2015. My parents bought almost everything for the kids' rooms from MFI. None of it is broken, 15-25 years later.