Aaaahh the FUD merchants are back.... Fear Uncertainty Doubt. Good strategy. Notwithstanding all military flying particularly is dangerous - hence ejection seats required. Ask anyone who has ejected what they would rather be - dead or injured?
The auto-eject function is linked via the seat to the FCS Flight Control System according to Martin Baker info. Early on I read that the auto eject system had dial in sensitivity but cannot find that info now.
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F-35
“Auto eject system Active on STOVL variant only
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The seat incorporates an auto eject function for the F-35 STOVL aircraft to be used in the event of lift fan failure. The auto ejection system utilises a signal from the FCS to initiate ejection....”
F-35
"The US16E Ejection Seat provides an unprecedented balanced optimisation between key performance parameters such as safe terrain clearance limits, physiological loading limits, pilot boarding mass and anthropometric accommodation ranges to fully meet the F-35 Escape System requirements. The US16E will be common to all F-35 aircraft variants.
The US16E is the only Qualified Ejection Seat that meets the US Government defined Neck Injury Criteria (NIC) across the pilot accommodation range.
The US16E design is common to all F-35 aircraft variants."