In that case if you have the extra dough you could maybe go for a 7900 XTX? It blows the 4070 Ti out of the water and trades blows with the 4080, it's also got a nice bump in specs but it will be lacking in things like Blender.
Vhirsion
Wait until the 4070 Ti Super, rumours say it'll have 16GB vs 12 on the 4070 Ti, if that's true it might be worth it, depends on the price completely tho.
By this logic, it'll take 100 months or 8.3 years before your battery capacity gets to just 80%, it's extremely optimistic yeah, but still, stop worrying about it. Worst case scenario you'll have to get your battery replaced after half a decade, at which point it'll be well worth it.
Battery life would be even worse than on the ROG Ally with max performance. AMD is the most efficient.
I'll keep my modded 2TB OG Deck with hall effect joysticks to wait for an actual successor. I'd maybe be inclined to sidegrade if they did a trade-in program, but otherwise not. Only reason is because all I want from my Deck is just a little bit more horsepower, not a lot, just a little more is enough, it feels just a tad bit underpowered to me sometimes.
Love to see more competition between AMD and Nvidia in other aspects than gaming. Competition in general is good for the consumer.