I think I have been to Ikea twice, I can only think my lapse of concentration resulting in the second visit was a rare blip.
From memory I went to buy some bedroom wardrobes and matching cupboards etc.
After selecting only some of what was required (I think large furniture had to be collected after payment), we queued for ages at the checkout, only to be told that the stuff we had picked was discontinued, they did not have some of it in stock, and they could not guarantee the order and could supply all that we wanted.
Hours had been wasted at this point, so I politely told them to keep their furniture, and got a refund.
I vowed at that point never to set foot in Ikea again, and some 16 years later that is still the case.
As far as I can see the whole basis of the way Ikea is set up is to maximise profits for the company, and make shopping there a miserable experience for customers.