My derailleur Trucker is already heavier than I'd like, Rohloff supposedly 600+ g heavier. Was initially intrigued by Pinion P.18 but it's a lot heavier than Rohloff.
A plus for derailleur (vs IGH/belt) is that modern chains are far superior to 70's chains: quieter & smoother even at an angle & shift quicker. Quick-link makes it easy to remove chain for cleaning.