He spends more time high-fiving people than actually defending nowadays. It’s all style over substance.
I watch other matches and you see defenders rushing out to block shots, headed clearances etc but Ruben just stands there legs outstretched in a half lunge pose, arms ridiculously tight behind is back (are you looking ref) and rarely gets close enough are in the correct position to block a shot. He also rarely seems to pick up his man and the move generally finishes with an effort on goal. Woltenmade had the freedom of the stadium for his three chances and for their second he ignored the line of defenders and played Guimares on. Was incredible in his first couple of years but regressed badly, esp since 2023.