With new, different engines come new, different air bleeding systems and new, different computer and control systems. With not nearly as well-established known failure/replacement rates.
I mean, one of the most modern passenger jets out there flown by Air France was lost in part because of frozen pitot tubes (airspeed measurement) - the other part being crew not trained properly to handle such an event correctly). These tubes been around a LOOOOONG time.
Not buying it. Sure hope Martin-Baker has better luck.
I have to agree with Secret Agent Man