Propagation delay is not a loss, indeed it works the other way: propagation is the general form, and capacitance and inductance manifest at low frequencies as an approximation.
Consider that all inductors are just lengths of wire, coiled up somehow or another, and all capacitors are two conductors very nearby, wadded up somehow or another. These are just transmission lines -- not very good ones (typically dispersive, or interconnected in weird ways), but the essence is there.
Inductor losses arise from well understood low frequency phenomena, so that we very rarely have to analyze problems as transmission lines, rather it's enough just to reflect on where these things are coming from.
Other wave mechanics apply -- skin effect primarily (and the analogous effect in lossy permeable cores, whether the loss is hysteresis or eddy currents).
Tim