Skirmish rulebooks

Hi, I'm reviving my hobby after ~10 years. If I own the rulebook from the old LotR:RotK starter set plus have access to basically all newer army stats (except Hobbit) from some army-list book and other theme books, does it still make sense to get the newest rulebook – and be it for nerd reasons? I got the one for the War of the Ring and it's beautiful.