Roger on modular systems, and “back in the day”! I went from an A-7E squadron to an FA-18C squadron, and some of that change was already underway. But, some of the differences are related to if the discrepancy is a “downing” discrepancy. In the A-7E, for example, the HUD is not a “downing” discrepancy, meaning, you could still go flying if it was broke. Not so in the FA-18, in which the HUD is the primary attitude and flight reference display. During the transition from A-7s to FA-18s, in the 1980s, one of the jokes was to make fun of Hornet pilot weenies, who couldn't fly without HUDs. It was true, if not a little bit unfair – the “Hornet weenies” were not allowed to fly without a HUD...
As for hitting things with hammers, try this: The A-7 had a big “box” we called the ASCU (Armament Systems Control Unit). When you selected stations for bomb release, Master Arm modes, release intervals, etc., etc., all that crap went through this box. It was full of giant relays and weighed about 90 pounds. Often problems related to this system were due to these relays getting “stuck”, and many of these problems could be fixed by removing this box from the plane, setting it down carefully on the deck, raising one edge about two inches off the deck, and letting go... This would often “loosen up” the sticky relay contacts, and the problem would go away for months!