For ex, combine Planck's constant, Newton's constant, and the speed of light to find the energy at which you'd see quantum gravity effects https://twitter.com/adept2u/status/851115353514008576 …
In particular, dimensional analysis assumes that all dimensional constants germane to a given problem are known -- a dubious assumption here
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It is also crucial to note that h-bar, G, and c, though fundamental within existing theory, may not (all) remain so in a theory of QG.
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E.g., one or more of these constants may acquire a status like that of Boltzmann -- in which case, the Planck units may be quite misleading.
End of conversation
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