The US generally does not export its most advanced defense technology. Almost all fighter aircraft exports over the past century have have limitations on its equipment. Generally the receiving country replaces some equipment with their own domestic variants. Israel and Japan do this with their US fighter aircraft.

Trusting an ally with any version of the F-35 is a big thing. The base F-35 is still going to be a very great fighter aircraft.

There is no such thing as an "export version" of the F-35. All F-35s have the same installed mission systems, the same avionics, and the same mission performance. This was one of the big goals of the program -- to give the US, allies, and other friendly nations a common, capable, 5th generation strike aircraft.

That's funny, I've read the claim multiple times in the media amongst the controversy over its procurement. Not least because it took years for the US:UK dispute over technology transfer to resolve during the Bush+Blair years.

Even since resolution there's unprecedented restrictions of maintenance in RAF service, requiring some major components returned to BAe in the US when BAe are a British based company.

I'm on my way out but a quick search seems to show Israel as having the least restricted version, which is a surprise: https://www.wired.com/2016/05/israel-can-customize-americas-...

Some discussion of the Blair era issues: https://www.defenseindustrydaily.com/uk-warns-usa-over-itar-...

The major components returned to BAE in the US are probably related to the AN/ALQ-239 Electronic Warfare suite, which is made by BAE's US subsidiary. BAE UK does not directly control its US subsidiary.

Just because Israel is allowed to add additional equipment to the F-35 doesn't mean anything in terms of the F-35 itself. Which, as I said, is the same as everyone else's.