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I feel like Wyll's story has potential but it's almost as if the writers gave up on him.

That may just be what happened due to the game having to be wrapped up. I thought his story was solid and relatable until the end, and then he got a Game of Thrones-finale with so many question marks. For instance, the Avernus layer of the Nine Hells/Baator that I know from older D&D books would kill an unprotected low-level character within rounds. That's why IG, my Tav considered him off his rocker after losing his powers. To me it was a bit of a bummer so close to the end, as the whole campaign arc otherwise fit even older editions of the Forgotten Realms settings neatly.