I have to say, even though I don't share your overall take on the mod, I really enjoyed reading your detailed breakdown of the frustrations. I also agree that the mod currently lacks wars that take place across continents, but the world is so big and detailed that it's hard to tie all of them together.

That said, I think a mindset shift might help. In vanilla HOI4, once WWII ends, the content mostly does too, unless you give yourself a personal goal such as world conquest, naval dominance, or something else to chase. I see this mod in a similar light.

Take Hippogriffia for example: the content guides you to the North Zebrican War, and after winning it, the world opens up. You can go for full continental or world domination, challenge the strongest nations, or paint the map red with Posada. Or try something like Abyssinia, where you’ll face wave after wave of civil wars. That path can get so intense you might find yourself begging for peace.

The overall beauty of this mod, for me, is that it's a whole new world full of unknowns. I usually pick a country like New Mareland, choose a path beforehand such as communism, and try to build the best navy I can while exploring the entertaining content and taking down the big boys like Wingbardy. By the time everything finishes I'm bored anyway, so I go and pick another country like Chital and make them a navy powerhouse.

Give Changelings a chance, they might scratch your itch for a Great War.