Game of Thrones: Why Omitting the Tysha Confession Ruins Tyrion's Character Arc

Any of you Game of Thrones watchers wonder why Tyrion's character arc took a tumble after Season 4? It all has to do with a girl named Tysha... and a pair of cowardly show runners.
I'm not gonna tell you which pair but... you can probably guess. My theory for Game of Thrones Season 8 and why the finale of Tyrion’s story arc... well it probably ain’t gonna work.
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