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Steve_Rayhawk comments on Harry Potter and the Methods of Rationality discussion thread, February 2015, chapter 113 - Less Wrong Discussion
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Concerning Transfiguration:
Pessimistic assumption: Neither partial Transfiguration nor extremely fast Transfiguration (using extremely small volumes) circumvent the limits on Transfiguring air.
Pessimistic assumption: Harry's wand is not already touching a suitable object for Transfiguration. Neither partial Transfiguration nor extremely fast Transfiguration of extremely small volumes lift the restriction against Transfiguring air, dust specks or surface films would need to be specifically seen, the tip of the wand is not touching his skin, and the definition of "touching the wand" starts at the boundary of the wand material.
Pessimistic assumption: Free Transfiguration doesn't work like a superpower from Worm: it does not grant sensory feedback about the object being Transfigured, even if it does interpret the caster's idea of the target.
Pessimistic assumption: At least in the limit of unusually thin and long objects, Transfiguration time actually scales as the product of the shortest local dimension with the square of the longest local dimension of the target, rather than the volume. Harry has not detected this because he was always Transfiguring volumes or areas, and McGonagall was mistaken.
In Azkaban is stated that Harry transfiguration of a thin cylindrical layer from the wall is fast because its volume is small. This seems to contradict your assumption.
Pessimistic assumption: Voldemort, and some of the Death Eaters, have witnessed combat uses of the time-skewed Transfiguration featuring in Chapter 104. They will have appropriate reflexes to counter any attacks by partial Transfiguration which they could have countered if the attacks had been made using time-skewed Transfiguration.
Pessimistic assumption: It is not possible to Transfigure antimatter.
Pessimistic assumption: Plans which depend on the use of partial Transfiguration, or Transfiguration of volumes small enough to complete at timescales smaller than that of mean free paths in air (order of 160 picoseconds?), to circumvent the limitation on Transfiguring air, will only qualify as valid if they contain an experimental test of the ability to Transfigure air, together with a backup plan which is among the best available in case it is not possible to Transfigure air.
Pessimistic assumption: Plans which depend on Transfiguring antimatter will only qualify as valid if they contain an experimental test of the ability to Transfigure antimatter, together with a backup plan which is among the best available in case it is not possible to Transfigure antimatter.