OK...

20 years ago the Intel processors we all use were starting to run up against fundamental limits as to how much memory programs could use. Most things were fine, but if you were editing large videos and photos it was a problem. Intel looked at that problem and said "let's design a new processor that isn't compatible with anything else, and we'll use emulators to make all the old software compatible." AMD looked at the problem and said "let's update these processors we already have so programs can use more memory, without affecting old programs that don't need it".

AMD won, and it took Intel about a year to release something that was compatible but inferior to what AMD was selling.