As for trying to self-source its defensive gear, that doesn't make a lot of sense for Israel. If they want to keep the US subsidizing its military, they have to let the US get some jobs out of it. It's doubtful that Israel's economy could sustain the full cost of its military if they were to no longer get US assistance.
It matters greatly if they run out of certain things again and the sitting President again denies them access to more. Yeah, it may well be hard on the economy of the country, but it's better than the possible alternative.
If Israel were fighting a defensive war rather than an offensive war it chose to start (yeah, Hamas was stupid to react the way they did to Israel's overreaction to the kidnapping of those three young invincible idiots, but they were predictably stupid, just as Israel is predictably stupid concerning the recovery of its lost soldiers, dead or alive) I don't see any US president this century as failing to turn on the material pipeline.