Ikea has for ages had the same price strategy: a super affordable tier that has an incredibly low price but is basically nice looking trash that might break within a few weeks and will definitely not survive you move to a new place. This tier exists to lure people in. Then there is a middle tier that tries to strike a balance between low cost also value for your money. The stuff in this tier is why other people tell you to go to Ikea because they have good stuff. Last there is their most expensive stuff, which is much less value for your money but is trendy and looks like designer stuff. This tier is what they put in ads and on Instagram, this is what they make most of their money with. Basically this is fast fashion but for furniture. It won't break as easily as the bottom tier, but you'll get rid of it in a few years because there is this new trend everyone loves. This is the least worth your money, in general.

But despite them following the same strategy and therefor i don't think their prices went up more than average inflation - i do think you're right when it comes to their quality. It has become more fragile overall, especially if you look at it over the course of decades.