What Is It With Fuji X and AF Performance?

"How is it that Fuji can write software code that borders on magic in terms of IQ, but can't seem to do it for what would seem like the easier task of improving their CDAF?"

Think you've answered your own query (if you think about it for a second). Fuji has had years of experience in colour management - but very little in digital hardware development.

Been using other's core technologies for a long time - only now are they producing stuff 'in-house' as it were.