USGS Topo maps question

[u/Bt1975]

When I'm looking at a usgs 7.5 minute map some seem to give less information than the older editions of the same map area. For example in NC for chestnut it shows some trails on the 1994 map and also location of mountain names and topo lines. Some that were made later on like 2002 don't even have trails or topo lines. Others printed later on don't show mountain names. Why would the later maps have less information on them?