Steam Deck seems to be a good fit. If you wanna get a gaming laptop, maybe wait until there’s one where you can easily swap out the batteries / components. I’ve seen videos about Framework laptop, and that does sound like a good investment for longer period.
I heard there were issues with ROG Ally, the device gets too hot, and the fan exhaust was near the SD card slot. So it frequently dislodges the SD cards from the slot because of the heat.