#2 It'll further tarnish his legacy
Remember that Super Show-Down match against Triple H? Remember the Crown Jewel match where he teamed up with Kane against a reunited DX? You probably don't want to remember that, and we don't blame you at all.
If anything, those matches proved that The Undertaker is, unfortunately, continuing to tarnish his legacy by wrestling over and over. The singles match against Triple H especially exposed how slow he had become at this age.
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The fact that he even returned after the supposed retirement at WrestleMania 33 only proved to hurt his reputation. Fans are clueless as to what his endgame is, and they definitely need some clarity.
As much as fans respect The Undertaker, the harsh reality is that the more he wrestles, the further he tarnishes his mystique and legacy.
We'd rather remember The Undertaker as the legend in his prime, not the part-timer who keeps going despite clear signals.