The single-uop FMA instructions beg to differ. As well as ADC, SBB, CMOVcc, etc, since Broadwell: 1 uop, 3 inputs. LEA itself has consisted of 1 uop for a very long time...but the complex 3-input version gets sent to a different place than the simple one.

The PBLENDVB case is interesting: the VEX-encoded variant takes 2 uops in every uarch, but 1 uops (since Skylake) in the non-VEX encoded variant that takes XMM0 as a hardcoded input.