Q: Should I really restrict myself to the Boostbuck family of topologies? Don't I need dozens of others?
A: Yes and no.

Q: Is it because the energy transfer stage of the Cuk Converter [transistor, diode, energy transfer capacitor, duty cycle modulation; or Q, P, C, D] is the capacitive equivalent of the normal (inductive) transformer?
A: You are very wise....

Q: So by transforming power with both L & C, we get the greatest possible design freedom, and therefore produce the best result!
A: :)