If it had the same price, the same performance, and twice the battery life, that would be an advantage to many users
I would make that trade, I would work less hours and spend half a day, everyday, off
Anyway
My matebook 13 does 15 hours of normal workload on battery while also being very thin and light (and 350 euros cheaper than an equivalent MacBook air)
It mounts an AMD Ryzen
I seriously doubt that I will need 30 hours on battery in the near future
Unless I'm stranded on a desert island, but I guess I'd have to face more serious problems then...
If it had the same price, the same performance, and twice the battery life, that would be an advantage to many users