So I think this is pretty controversial thing to say.
- The Temple of Elemental Evil was never set in the realms before so isn’t invalidating anything.
- The Tomb of Horrors was never set in the realms before and ToA is an entirely new layout and setup
- Curse of Strahd has nothing to do with the realms (and is pretty damn amazing)
- Ghosts of Saltmarsh has nothing to do with the realms.
Everything else is original. How on earth are reprints cash grabs or lacking originality? Curse of Strahd, Saltmarsh, and Tomb of Horrors are the best campaigns I’ve played in for 5e. They dramatically expand the original adventure and bring it up to date. I couldn’t face a re-run of Elemental Evil because the 3e one was so mentally scarring. Some things need a reprint!