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Agree to this in the sense that the supposedly obsolete 90's gear is in fact better made and probably lighter than contemporary Sora. I had old Shimano DX bar ends on my 8spd Nago Cx bike and Campag bar ends on my tourer: loved both for the reliability and performance and were pretty light groupsets too. Modern Sora probably has plastic internals and is v heavy so I don't see the point.
I'm into this Sora thing. It's basically all the same shimano shit anyway. People were doing amazing long rides in the 90s with gear you literally cannot give away now. As long as the gears are indexed I don't think it will matter at all.
Or, and this is thinking outside the box, belt drive.