Support for decoupling from American arms has been slowly growing among Israel’s Right. Moshe Feiglin was first to propose it years ago that I heard.
For one thing, it allows Israeli military too much independence from the elected government.
Here’s Avi Abelow from his own podcast:
https://youtu.be/01zOi35YVnE?si=0gd6nCsCymmsSKed
They do produce their own 155mm howitzer and 120mm tank rounds of all types.
They produce their own 5.56, but shoot American Colt M4s.
They produce (with, apparently Raetheon, I’ve been told) several types of anti-missile systems. Some seem purely indigenous (Iron Dome), others seem joint projects (Arrow, David’s Sling?).
Their Merkava tank is apparently all indigenous.
Their planes, bombs and guidance packages sound mostly purchased from us.
What I see there is vastly, but not completely, Israeli made already.