I would love better battery life, but personally, running manufacturer-supported Linux is worth the tradeoff: every Linux tool I'd run in production works for every program on my laptop (no need to set up VMs, and even then, the Linux tools can't work with or inspect what's running on the macOS host...); containers run at full, native performance; games on Steam work much better than macOS (it's literally just a bigger, better Steam Deck!); plus the niceties of upgradeability.

If I usually worked from cafes, or spent many hours a day working on planes or trains, all-day battery life would be at the top of my list. But I usually work in workspaces that have power, so... It would definitely be nice to have better battery life, but other features are higher priority for me.