While low-power has been the selling point for MSP430, in practice I understand the shitton of effort poured into making ARM power-efficient has allowed them to

While low-power has been the selling point for MSP430, in practice I understand the shitton of effort poured into making ARM power-efficient has allowed them to surpass MSP430, see e.g. https://www.eembc.org/ulpmark/ulp-cp/scores.php https://www.eembc.org/ulpmark/ulp-cp/scores.php