Ya after we stopped using the F-14 there was concern about Iran and in order to prevent them from being able to maintain their aircraft our government put in place policies that prevented the sale of parts of the F-14 and destroyed and scrapped alot of the aircraft in mothball as well as part reserves, there's a podcast called The F14 tomcast and fighter pilot podcast were they go over the whole situation in more depth I'm sure there's a lot more to it but as for why you don't see them still flying around today as like museum planes or airshow aircraft has a lot Todo with the lack of replacement parts. I probably should have specified I wasn't meaning why the US Navy or military no longer uses them.

Aircraft require the replacement of parts based on flight hours so each part of the plane including the actual structural components have a clock ticking down from the time of installation that moves more quickly based on flight hours. At the end the parts are either replaced rebuilt or inspected and repaired but when you don't have replacements and there isn't any manufacturers still building the parts your over all aircraft life expectancy could be the next flight.

Iran I imagine has to have reverse engineered the aircraft to find ways to make parts and keep them flying. Maybe china I hear they love to do that kinda stuff lol.

As for the rest I'm gonna have to watch the video you suggested cause now I'm curious