a 92.55% reliability rate is not exactly impressive, at least not in
a favorable sense.
it might be tolerable if a failure of the PTR lookup doesn't cause
the application to fail.
If people's livelihood depends on something, they're more likely to insure it
actually works. Very little depends on PTR records doing anything (with a
relatively few exceptions of sites that configure it otherwise). The fact
that Bill's getting a 92.55% reliability figure for something that the vast
majority of people use to get something other than IP addresses in logfiles is
actually surprisingly good.
if applications were
written to depend on DNS reverse lookups in order to get endpoint
identifiers of their peers, they would only work as reliably as DNS,
which isn't very good.
If it "isn't very good", try using the Internet without it for a bit.
In your view, what is it in the DNS protocol(s) that results in a lack of