There are definitely different tiers. I've bought simple shelving that began to fall apart within years (Billy maybe?). I have 10 years old bedroom furniture still going strong (Kallax/Malm).

Did you read my whole comment?

I said some lasts less than a decade, and I have quite a lot of IKEA furniture. I also said its better than most cheap furniture.

I even mentioned a specific piece of IKEA furniture I own that is clearly not going to last a decade.