Distance is the sleeper lever
Halving subject distance quarters depth of field — a stronger effect than any aperture jump. Portrait photographers "step back and zoom" for exactly this reason: same framing, more working depth. The calculator shows the distance effect explicitly; the muscle memory comes from using it.
Hyperfocal in practice
Focus at H and accept sharp from H/2 to infinity — the maximum sharp zone for any aperture. In the field: compute H once per lens/aperture combo, tape the distance, and landscapes stop being focus lottery. Combined with f/8 (past diffraction's f/16 cliff), it is the entire landscape focus strategy.
Diffraction: the far cliff
Past ~f/11 (full frame), light bends at the aperture blade and softens EVERYTHING — the DoF gains reverse into global blur. The "f/22 for landscapes" folklore walks off that cliff. Hyperfocal at f/8 outperforms everywhere-sharp-at-f/16 on any modern sensor; the calculator's hyperfocal line is the proof of concept.