One reason I can think of for doing this is that much of this old knowledge is no longer available in a form that can be accessed. There is a lot of information that we have lost. Sometimes it can be very valuable to not only see what was done, but also how it was done. In this day of fast processors and huge memory and storage devices some of the methods and tricks they used can be very informative. We may be faster, but we are also much less efficient. They had to make things work without the benefit of small die sizes and our more modern manufacturing methods.
They might also be able to explain why the 6502 had to have the feature that if certain operations happened right on a 256 Byte page boundry the code would wrap around to the start of that 256 Byte block instead of going to the next 256 byte page. - the 6502 was truly an 8 bit machine...-