Zverev, Alcaraz, and Tsitsipas all played mediocre to outright poor in the sets they lost so a big part of it—probably the dominant factor—is their sloppiness. Don’t know about the other guys but Schwartzman is past his peak and Shapovalov is Shapovalov.
Nadal on first week Wimbledon grass is a special case just due to how incredibly prone to upset he is there compared to most other top players at any Slam tournament. Even in his best years he was going 4/5 vs. a bunch of players in the first week.
This has been a patchy match for Carlos but I do have to admire his grit. I haven’t seen any nextgenner from the last 10 or so years with the kind of never-let-up attitude he has.