As
@Gammadoodler posted, framing this in terms of
verisimilitude is a red herring at best.
Verisimilitude is about whether the fiction - in tone, theme, implied and express content, etc - "hangs together" as a representation of a fantasy world. It's not about minutiae of mechanical subsystems, or certainly not per se about such things.
Page 29 of the Basic 5e PDF, setting out the wizard class, has the headings "Scholars of the Arcane" and "The Lure of Knowledge", but nothing in the rules requires a wizard to be proficient in Arcana, or even in any knowledge skill (they can start with Insight and Investigate, for instance). A rogue need not have Acrobatics or Athletics (and likewise can start with Insight and Investigate, and say Perception and Performance for their other two).
A fighter can start with low CON yet Second Wind; can have terrible DEX and always attack last yet have Extra Attack; terrible DEX and no Perception or Insight proficiency yet take Protection fighting style; etc. Remarkable Athlete doesn't require any minimum stats or proficiencies. Gating some mooted enhancement of Remarkable Athlete behind a proficiency requirement is imposing a design stricture that does not operate elsewhere in the game.
Likewise for insisting that a fighter player can
only kill by dealing hp damage, while other classes (eg the wizard's Power Word Kill) do not conform to any such requirement.