We're comparing the Martial Adept feat and the Magic Initiate feat. While the effect of linear fighters vs. quadratic wizards most often manifests in class design (mostly due to spell access), there’s an interesting reflection of this design in the 5e feats, which we expect to be balanced against each other.
Dungeons & Dragon’s May 2018 Unearthed Arcana released the Centaur race. There was mixed reception of the decision to shrink playable Centaurs to Medium size. Due to D&D 5th Edition's design, it was the right decision to keep them medium, as depicted through most of art history.