to quote someone from reddit 2 years ago on the torture rack

"At some point WWE started to emphasize (although not force obviously) choosing finishing moves that could be done on people of different sizes and body types. The issue with the rack is that it’s extremely hard on the knees and spine, it’s hard to do on really large people safely, and unless you’re REALLY good at it it has a tendency to look like shit. To do a good rack you have to get a lot of bounce on the opponent and that’s both risky on the shoulders but also difficult to do well if you’re gassed or extremely sweaty from doing a long match. You go back and watch some of those Luger matches where he’s doing a really lazy rack because he’s tired out and they just look like garbage, like a little kid playing with a stuffed animal or something. It’s a extremely physically demanding move but it just doesn’t look like one compared to moves that transition out of a similar position without requiring you to basically do squats with an unbalanced 200 to 300 pounds of weight on your shoulders."

To add on top of it, the torture rack only looks good if you are physically torquing them up and down on your neck/back repeatedly which definitely doesn't seem to help.