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Maybe I can make it in a contrasting statement for illustration. When you are dealing with RF bypass, DC block or similar purposes, you don't really care what the Q is as long as the total impedance is low enough (i.e. adequate C with low ESR). Similarly, when you are making an RFC or common mode choke, you don't really care much about the R part as long as the whole impedance is high enough (in many cases, such as EMI/RFI reduction, high R is even desirable). However, in a tank circuit, the question is Q=X/R. Putting caps or inductors in parallel always scale both X and R so there is no net change in Q.