Why is an L-network of limited utility in impedance matching?

An L-network is the simplest form of impedance matching network, consisting of only two reactive components (one in series, one in parallel). Because it lacks a third component, the network's quality factor (Q) and its impedance transformation ratio are mathematically locked together. This dependent relationship means you cannot independently choose the circuit's bandwidth (Q) for a given transformation. Consequently, the L-network is rigid and is only practical for matching a very small, specific range of impedances. The limitations of an L-network are purely based on its mathematical topology. It is not inherently thermally unstable, and its power handling is determined by the physical size and ratings of its inductors and capacitors, not the fact that it is an L-network.