Battleship blast protection is possible but expensive

Were radar and missile systems too vulnerable to gun blast to fit on reactivated Iowa-class battleships?

They were vulnerable, but shielding could address the problem if the navy was willing to pay for it; cost was the stronger constraint.

Radar arrays and missile equipment can suffer from main-battery blast and maintenance demands. Those vulnerabilities do not create an absolute technical barrier. Protective design and shielding can reduce the risk, but they add cost and complexity. Affordability can stop a modernization that remains physically possible.