Dale, I disagree with your characterization of "after" being an "estimate" or "guess." If the profile provides a source (appearance in a census, mention in a will, signed a deed) that a person was alive at a certain time, and no records have as yet been found after that date, then after is the correct characterization for the date field. It's not a "wild guess," it's a fact.
IMHO, the terms Before, After, and About have different intents. The two former terms should be used to document facts. About is the only term that should be considered an estimate.
"After" does NOT have the same meaning as "about." I certainly agree that a death date characterized as "about" should be expected to have a relatively small range associated with it. 5 years is probably reasonable.
I find it much more frustrating to find profiles that do NOT have anything in the death date field when the profile provides information that could be useful about the death date
EDIT: As there are several wikitree functions that provide condensed data for individuals (name - birth - death), I found it quite convenient to have something appearing for dates.