Iran demonstrates 1950's technology - probably based on the missiles Reagan sold them

Pres. Reagan secretly sold surface to air missiles to Iran, during the Iran- Iraq war, ostensibly to free hostages in Lebanon, but also make profits and use the money to support the Contra rebels in Nicaragua who were fighting against a Parliamentary democratic socialist government.  So Iran launches surface to air missiles in the straits of Hormuz - so what?  I dont get what the big deal is about.  The technology is from the 1950's.  I remember surface to air missiles in place on lake shore drive in chicago during the cold war, to protect the city from a nuclear attack (seriously, this is no joke).  included is a picture of Nike missiles in Hyde Park, Chicago, from the 1950's - to defend chicago against a russian nuclear attack !  too funny....