What do you have to lose by not including Jinteki cards in your HB deck? Snare! is great for RnD and HQ protection and setting up a surprise kill. Mushin No Shin can be an important fast advance card and a good bluff alongside some Cerebral Overwriter. The biggest loss here is Caprice Nisei though, and that alone might be enough to discourage the use of Custom Biotics: Engineered for Success.
So without access to these cards, what are you left with? You can still threaten the tried and true SEA Source/Midseason Replacements/Scorched Earth combo. Fast Advance play is definitely an option as you can slot in 3 copies of SanSan City Grid and still have 13 influence to spare. You can still make a great Glacier HB (although not having Caprice here will definitely hurt.)
There are definitely a lot of options that Custom Biotics: Engineered for Success opens up with so much influence to spare. And the loss of Jinteki cards isn't that impactful for the most part. So why doesn't it see play?
Simple: Why play CB when you can get the pure economic advantage inherent in Haas-Bioroid: Engineering the Future? And that's what it usually comes down to with HB. EtF still have the best built in econ in the game, and with added access to Caprice Nisei, that is why CB will almost always remain in the binder.