Document whatever you want to disseminate and don't assume that the end use will be the web in any event. Don't forget, that 'standards' will differ over time and by location as your coordinate system aptly demonstrates...speaking as an NAD_1983_CSRS_MTM_9_2951... others with a more worldly perspective, like GCS_WGS_1984_4326 and WGS_1984_ World_Mercator_3395, may care little about the locale or local perspective.