Tbf, there's only a handful of defenders in the history of football that rival Ramos' match-winning qualities on the front end. Most of them probably liberos. World class defenders were usually world class without such an impact.
And again, I won't challenge anything when it comes to Silva at PSG, but I don't think it's true for his peak self. For Milan and Brazil he often acted as the wavebreaker who left the backline to break up attacks in front. Signature move, I'd say. He also defended as last man, and it was exactly the seamless switch between both modes, and his decisionmaking when to do what, that I find impressive.
Would be interesting to know the reasons for that apparently quite drastic change in style, at least if it goes beyond declining athleticism.