Power electronics cover a lot of territory, from nanowatts to kilowatts. But designs at all power levels share a common goal, namely to improve efficiency. Market trends like SiC and GaN introduce new complexities into your power conversion circuits with faster switching speeds to get reduction in passive (induction and capacitance) component sizes, requiring the need to be precise in circuit timing. You need to deal with higher sensitivity for gate threshold voltage and timing. You also need a more robust PCB design for EMI/EMC issues due to higher switching frequencies.
Andreas Vinci, Tektronix on behalf of C.N. Rood