Assertion: linguist's language | /r/HasProperty | susceptible to such pressures
Facets:
Source sentences:
text: Diachronic explanations like the ones above (and the detailed perceptual account provided by @jlovegren) can potentially explain the source of the loss or gain of a sound in a particular language, but (excluding the ASL example) they don't explain why some languages have been susceptible to such pressures and others haven't.