You buy something one day, and it starts to deteriorate and become janky after a year, and you'll have a buy a new one. All products have gone through spreadsheet cost optimizations.
It wasn't always like that. If you're lucky to get your hands on an old IKEA bookshelf (Billy), it's sturdy and will last forever.
I also inherited some “regular” living room furniture after my mom passed away. It cost about four times as much as IKEA’s higher-end lines. After moving it from my mom’s place to my office, I can already see it falling apart after just three years (total lifetime as my mom only had it for two). The quality is so shite that I honestly wish my mom had bought IKEA.
In the future, I’ll either buy custom pieces from a furniture maker or choose IKEA's higher end lines for longevity and reusability.
I had a LACK table (9.99 euros at time of acquisition) last for 10 years before a move forced me to give it away. I also have a few random things from them (wooden cutting board, grater, I think a bookshelf) and everything is pretty OK, even the cheap stuff.
Funny thing is, I haven't bought much furniture for ages since my old IKEA stuff has lasted for several decades and is still going strong. Their major kitchen appliances are crap, though.
high quality furniture loses most of its value the moment it becomes preowned, so it only makes sense to buy if you are absolutely certain you aren't going to move anytime soon, which is not realistic for most people. Ikea is just good enough.