Anyway you shake it, Tom was basically denying ontological categories, insisting that some day, the quantitative will entirely "explain" the qualitative by way of physical mechanisms. If it couldn't, that would place a limit on measuring (science), and that's really the underlying issue here, IMO.
Just as fundamentalist religious folk insist on the infalibility of doctrine, Type A physiclists will challenge you to the death before they accept that the explanitory power of time-bound (linear-causal) physical processes has limits.It doesn't matter what arguments are presented per the apparent impossibility of jumping from matter to mind, they'll have none of it.
This has led to a mountain of tedious, circular, tortured, and outright absurd agruments to try and posit physical properties as fundemental, as the end-all. But if we look closely at this whole fandango, with all of it's wonky loops and detours, the rock bottom issue is almost certainly epistemic.
As mentioned elsewhere, Nagel said that experience begets a data stream with information totally absent in any and all quantitive descriptions, no matter HOW exhaustive. As a long time rock climber, for example, a guide book might describe to me every last geological detail of a given strecth of rock (a climbing route), but it can never disclose what it is like (the experience) of actually CLIMBINGthat route. Moreover, I might have the total quantitative description of Pappy Van Winkle Bourbon, or the total physical description of a certain woman; but neither "scientific" description of either the booze or the woman can POSSIBLY tell me what it's like to drink the bourbon or be with the woman. We all know this as a simple and certain fact.
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This seemingly irrefutable fact of life is roundly refuted by physicalists because it places limits on how much quantifying can tell us about reality.
That, I believe, is the real psychological issue that drives a physicalist to conconct such a breaking wave of ludicrous counter-arguments to the fact that experience holds information beyond what science can explain in strictly quantative terms. Note that virtually all of these arguments involve wholesale conflation: the experiential is actually the physical; the 1st person is "contained" and postulated by the 3rd person (Nagel's "view from nowhere); or most absurdly, Marry (Marry's Room), should she have the required 3rd person data, would be able to "know" all about color having never experienced red, green, etc. The idea that intelligent people can make that argument boggles the mind.
A last factor, perhaps, is our standard way of "explaining" any thing or phenomenon by virtue of some other thing (force, property, etc.) or phenomenon. While we can't yet do so with consciousness, the physicalist believes it's just a matter of finding the right measurements, then all will be clear.
And the beat goes on....