Can you fill me in without search? I somehow missed the whole thing.

IIRC

The home button and the bezel were made by different manufacturers IIRC, and the two plastics aged/coloured at different rates.

It took them ages to get it such that the button and bezel will colour match perfectly.

Easy to do with black, very difficult with white.

Fill you in about what exactly? And what do you mean by "without search"? There is contemporaneous reporting on the matter available online, it's going to be more useful for you than someone's twelve year old recollections.

https://arstechnica.com/gadgets/2010/06/apple-delays-white-i...