two factors to keep in mind:
1. export models that the U.S. transfers to semi-allies like the Gulf states are often missing the most advanced features that U.S. models have, so you cannot assume Gulf States F-35s would be as capable as U.S./Israeli models;
2. Except for Israel, most nations in that region have abysmal military and maintenance skills. Pilots often rely on VFR only and do not use all the fancy electronic equipment. They also totaly rely on U.S. technicians for maintenance. So those planes will not pose a threat to Israel and if they did, it would be very easy to neuter them.
Providing military equipment is a very cheap price for finally moving forward with normalisation of Israel's status in the region.
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