Thing is... The size of the pilot, as a body property, is *one* thing. It is a one size-size-fits-all jobbie (at least for now), and I can deal with that (even if it is quite hilarious to see the somewhat pudgy face of my as-undistant-as-I-could-manage facsimilie, pinned like a paperdoll cutout atop a body that may be the wrong side of the "trim-and-zero-g-adapted" to "severely-malnourished" threshold (especially in that full-body shot in the codex). :9) -- Senior citizens with bodybuilder/runway_model physiques in a world of people of perfectly uniform height and weight is a familiar concept in video games after all, probably to the profound relief of thousands of animators. :7
Question is: Does a metre look like a metre, to every viewer?
(I recall this billiards game that, prior to "solving" its issue with a world scale slider, made you feel like you were in a dollhouse, filled with miniature people, and dinky little pool tables for gnomes (even though measuring them IRL, using the controllers and a yardstick, the numbers came out right; they scaled proportionally between real space, and smaller-appearing virtual space -- just the duo of projections were off). :7)
(EDIT: Also: If one see the world changing scale, when changing the IPD of a Vive or Rift, the application is definitely doing something wrong (EDIT2: Rift DK1 was a different matter - it didn't have the same coupling and realtime updating).)