For me, it's how smartphone companies have completely given up on pop-up selfie cameras, despite them having suffered no catastrophic failures when they were a thing.
They held up well, and the OnePlus 7 Pro remains to this day the best looking smartphone screen you can get in 2022 despite despite being a 3 year old device.
But they went back to notches. All brands did, even Xiaomi (Poco) and Asus (ZenFone).