It also seems likely that the perf hit from x86_64 -> ARM64 emulation, even if the emulation is really excellent, might very well eat up any battery savings from the more efficient ARM chip.
My understanding is that ARM chips work fine for gaming when games are built for ARM, but that is far from the norm at the moment.
We waste less by often making small trips to a local market to get just what we intend to cook for one day or evening. That may not work for everyone, but it works for us.