I don’t see this as a massive barrage of a strike on Israel proper. May be some of its northern Israel or Golan held areas, done out of Iran to show proportionately. Since Israel did a first, its Iran’ first.
I thin the readying of 100s of drones is a deterrence for the next phase of escalation.
Iran would not want to use its proxies since symbolically it has to convey it is responsible for the retaliation to match the fact that it was Israel air power that came from Israel to do so.
If the next phase of escalation occurs after this, i.e. all out attacks on each other, Iran has to lose more diplomatically and economically (if its subject to a naval blockade and oil exports impacted) then militarily.
Iranian population and cities have tolerated 9 years of attacks from Iraq when it was backed by everybody else.
I think Israel, for all its air supremacy has only excelled because its Arab adversaries in every war have been losers. With the size of country that is Iran, and the long range the Air Force would have to go to project power, Israel will run out of bombs before it has any real impact on neutralizing Iran. Yes it can attack a prized nuclear plant or two, but if that doesn’t change the strategic picture long term.
It’s a one way to go undetected and Israel will lose its element of surprise, which has been its main advantage in the past. Even in 1981 Iraq nuclear attack, it was detected by the Jordanians in the short distance to Iraq. It actually overflew King Hussein’s yacht but of course Jordan was only too happy to see Saddam neutered. Today’s Iraq and Syria will at least give some warning of their airspace being crossed.
If only one other country in the region could stand up to Israel in addition to Iran, this would be game over. Unfortunately they are all losers from Egypt on down to the GCC.