I know. I simply find him dying at Carkoon far more appropriate than at Endor. Endor works better from a narrative perspective as raising the stakes for the finale, but the part with Jabba was way too much of a flawed, elaborate plan to have only Han's return make it worth it taking up so much time in the film.
Luke becoming Vader would've been completely nonsensical and ruined the film, seeing as how it betrays everything his character arc in this film was going for in regard to saving his father all for the sake of an edgy plot twist.
As for Kashyyyk, that's quite a mixed bag. The imperial troops being beaten by Wookiees in combat would make more sense due to their physical strength if getting in close and the power of the bowcaster. However, Endor was a far better suited environment for setting up guerrilla tactics due to how easily it was to hide traps in the densely forested area, whereas Kashyyyk's natural qualities would be limited to purely relying on the high ground for victory. Overall, I'd say Endor was a better choice if we couldn't change the environment of Kashyyyk, as it's inhabitants facing the Empire would've been far less limited than a world that was under severe imperial occupation for years.