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It's a _theoretically_ excellent one but only under the proper conditions
the low-power-e cores on intel CPUs are not inside of the main core complex, they're in the I/O die; if they're the only cores active, and the power management is configured correctly, the _entire main CPU body_ can be effectively shut off.
Theoretically, as long as LPE-cores are sufficient (mainly idling, maybe just a text editor open, or video playback through the GPU without CPU involvement etc), it reduces CPU power consumption by a pretty decent amount - but CPU power consumption isn't really a _huge_ factor anymore, so it ends up being like...10-20% difference in battery life IIRC?
I _think_ some of the video-playback-only battery life tests are some of the best results _because_ the CPU is basically off for 4k video playback now?
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In principle it shouldn't be terribly hard, though of course the hard part is the real world, not the principle :P
You don't want to be migrating to/from LPE cores all the time, that's not power-efficient either; what I'd probably do as an experiment at least, on 9, is to just disable all non-LP cores.
It'd make compilations slower but for the 99% of time when it's just file system + text editor + music player, whatever