This is true at a most fundamental level, but the things which make land valuable can absolutely change over time, in terms of its presence-in or proximity-to v

This is true at a most fundamental level, but the things which make land valuable can absolutely change over time, in terms of its presence-in or proximity-to various other things (cities, amenities, natural resources), or ways that it is maintained or let go over time (soil erosion, pollution). And of course, there are a lots of factors which are totally outside of the individual's control— a falling aquifer could make digging a usable well prohibitive, for example, or maybe your land is on the coast of Florida and will be underwater at high tide in another few decades.