Hello and thanks for the kind words!
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Ability score damage is there for wardens to implement and for future books. There are some monsters in the Bestiary that do ability damage, for instance. Your first thought was right about ability and fatigue. You need to make the save and you take a point of fatigue.
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Think of Resilience as your ability to stay in the fight. That’s depleted first, then you take Strength damage when Res is 0. Having a full inventory reduces your Resilience to 0, it doesn’t kill you outright. Essentially, you’re overburdened by fatigue and have no more fight in you, therefore you’re easier to kill.
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Perplexing Ruins and Chaoclypse on YouTube are both great resources for solo play, as is Stoneaxe Tabletop Gaming. The various Vaesen RPG books are great for creepy Scandinavian folklore and mythology. The Dictionary of Northern Mythology by Rudolf Simek is also a great reference book.
Hope this helps!