What I refer to as "point drift" was just an (early?) CHM thing -- I'd noticed coords getting out of sync on junctions/multiplexes, too much to be explained by collaborator failure to copy/paste coords from existing files.
Nowadays, that won't happen unintentionally -- any changes to .wpt files will be recorded as part of a commit in the HighwayData repo.
One might also use the term to refer to points gradually moving farther away from center lines as shown in OSM. This can be explained by the fact that we're now using more mature datasets, with more accurate geometry than what was available in the 2000s. Little to worry about here IMO; there's probably much less room left for improvement.
In the early days also, I think less attention was paid to point precision. ISTR that the earliest days of the (pre-Clinched Interstate Mapping) HB used TerraServer. Converting from that would yield much lower resolution coords in the first .ggm files.