Earlier quoted context omitted.
> we made sure to screw all IKEA furniture to the wall That's what the instructions tell you to do
I'll check next time, because I've never noticed it, nor have I seen many people doing it.
IKEA also sells furniture of varying qualities - for example, KALLAX is a well-known line of shelves that many vinyl enthusiasts use to store records. Records are extremely heavy, but these stand the test of time.
Another example is in the bedroom department: MALM vs KULLEN. The former is much thicker and sturdier, with drawers that have metal hardware. Kullen on the other hand is thinner, flimsy, and uses plastic hardware for the drawers, giving them an awful tactile feel.