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I assume because wheel and groupset weights don't account for the discs themselves? Them shits are heavy.
FWIW I have a disc Road bike as my only bike. It's great and does absolutely everything I need perfectly. That said, if I were to do it all over again I am not convinced I would go discs. There will be some mad rim brake bargains over the next few years as everyone sells up and goes disc too... #savetherimbrake etc
Mmm not sure how you worked out 500g+ for disc versions of the same models. Surely more like 150-200g?