Point well taken!
I'm just a bit skeptical when someone says a particular Shimano product is junk personally I don't believe any product, group set or equipment they ever made could be classified as junk, & believe me I don't have a company bias toward Shimano I have bicycles equipped with (1w)SRAM, (2w) SUNTOUR & the (3w) Shimano, & in the past had a bicycle with a Campagnolo group set with no complaint's or issues at all. But may be that person either had a bad experience owning RSX or is making a comparison to what is currently available? Its a bit of a stretch to compare state of the art technology, lets say the new 2017 Dura ace group set with something from the early 90's as far as performance is concern there can simply be no comparison!
Not just measuring grams but also in function,durability from advances in materials less friction as well as aero dynamics & aesthetics. The same holds true for caliper brakes can they & will they stop you safely & dependably each & ever time you apply them? Absolutely without a doubt they will & have for many many years but compared to a new road hydraulic disc brake system,
No comparison! Especially if your out in the wet weather, also if you like carbon fiber rims a disc brake frame set would be a much better alternative than exploding wheel sets at 50 or 60mph! Didn't happen yet? Probably won't if you have an alloy brake track otherwise Good Luck with that because the research & science basically say in due time? Catastrophic failure the resin bonding the carbon fibers just cannot take the heat, weakening the rim while heating & expanding the air inside the tire. Time & Chance who can say when the inevitable BOOM will be heard.
Anyway sometimes contradicting opinions are a good thing as long as there based in some factual evidence or experience of some kind, its how improvements are made or discovered.
Enjoy the rest of your day