On that note; I've found that if you add glue or contact-cement to the joints of the bookcases when you assemble them, the resulting bookcases are substantially more durable.
The fixings supplied and the material construction are just not capable of providing a solid, permanent result otherwise.
Unless this is meant for subsequent owners/houses?
I've never had an issue with IKEA disassembly/assembly having moved/lived/purchased across 3 continents, but I have always done my own assembly/disassembly.
I was looking for a new work desk, planning to spend no more than 500 PLN - because IKEA is cheap... All desks within that price were wobbly pieces of glue and wood dust; then I found one for I believe 1500 PLN, 3x my intended budget, but imagine that: actual full metal frame! I could sit on it and it didn't even squeak, much less wobble. So I got it...Really love that desk, no problems with it over the years.
So yeah, they have cheap temporary stuff, but usually also have at least a couple of higher-end pieces per category... with accordingly higher prices.
Of course, the downside being that it does look like utility office furniture and is not exactly stylish.
Everything that has metal connectors with fasteners on both sides still works well on 2nd or 3rd assembly in my experience.
I've got a set of billy bookcases, a metal-framed desk from their 'desks for office' range, two double beds with mattresses, and a 5-seater sofa. It's all lasted fine.
Of course, as a veteran DIYer and woodworker, my furniture has the benefit of being assembled right and treated with respect. And nobody in my household weighs over 150 lbs, which probably helps this stuff last longer.
Even the IKEA swivel chair on which I sit all day in front of a computer is about ten years old and it is still good enough. It was however one of their more expensive models.
When my mother was alive, she has also used an IKEA armchair for about a decade and she was very satisfied with it.
I read the reviews and a lot of people attach heavy monitor clamps without realizing what the desk is, and it crunches in over time. Maybe it's a lack of communication on Ikea's part as it's meant for simple table/desk stuff, not a full wood computer desk. And it kinda looks like wood. But it's super cheap and looks nice, serves a particular purpose.
[1] tear down video shows the honeycomb material: https://www.youtube.com/watch?v=9vNRY6natiY
Note: definitely not my hobby, and I'm not going to consider waste and other impacts. So please, don't pitchfork.
It seems to hinge on this, but inexpensive doesn't imply a lack of durability. A sibling thread has many examples of durable Ikea products. Additionally, if cost is an issue, one can defray the cost of a fresh new table by selling their current perfectly usable table via a secondhand marketplace vs throwing out a broken one.