I can tell the difference between a good basic pair of headphones and garbage pretty easily. There’s a noticeable difference between basic cans and higher end cans too but it’s a 15-20% improvement for a 500-10000% price increase.
If someone’s happy with older airpods then more power to them, I don’t need much more than a pair of Sennheiser HD598s myself. Would I take HD800/820s if offered for free? Absolutely. Will I pay $1600+ for them, not today.