He specifically cited bad battery life on the ROG Ally and Lenovo Go, saying that getting only one hour of battery life isn’t enough. The Steam Deck (especially the OLED model) does a lot better battery wise, but improving power efficiency should really help with any games that are maxing out the Deck’s power.
I assume the next Ally and Go will be a test platform for AMD. The main focus is probably Steam Deck 2 and next XBox Infinite systems.