I think we’ve been spoiled with how the big 3 could handle marathon 5 set matches in their prime. Rafa was a beast, Federer was efficient and Novak seemed to get more limber as a match went on. Maybe part of it is the mental aspect, but these ‘younguns seem gassed and mentally/physically spent and don’t always recover as well these days. I’m thinking for example Tsitsipas 2 years ago in the FO SF with Djokovic where he admitted to getting fatigued. And after beating Rafa in that grueling AO 5 set last year he went down rather tamely in the SF’s. IIRC last year Medvedev after coming back to beat Cilic in 5 sets at Wimbledon lost his next match( also in 5) to Hurcaz. Both guys are 0-1 in 5 set Major finals.
Obviously Rafa can’t afford these days multiple 5 set marathons, but to requote Medicated Matts:
“You can’t be the favorite in the fifth set of a Major finals, if you’ve never won a 5th set in a Major final.”