If you stop to think about it (apologies to Helmholtz who may not yet have known about evolution?), having the relaxed focus at infinity seems an unlikely result when most important events and tasks involve much shorter ranges. Also it would be difficult to make corrections for any reason if there were no further adjustment possible in that direction.Relying on wikipedia.de, I believe that's the original 1855 Helmholtz explanation, which since has been expanded (1980s-ish, it seems) by identifying some muscles that support accommodation towards infinity. I believe that would imply a finite (but long) distance for relaxed focussing, but the article only mentions this aspect in passing.
There was some discussion (even measurement!) of this here a couple of years ago. As I recall it varies individually, in a range of around 1-2m. Search this thread for "resting focus": New Horizons II