Honestly, why is this such an appealing feature? Are you often away from an outlet for 20+ hours?
I use 6+ year old laptops that last 4 hours at most on a single charge, even after a battery replacement. Plugging them in every few hours is not a big inconvenience for me. If I'm traveling, I can usually find an outlet anywhere. It's not like I'm working in remote places where this could even be an issue.
Then there's the concern about fan noise and the appeal of completely silent computers. Sure, it's a bit annoying when the fan ramps up, but again, this is not something that makes my computers unbearable to use.
And finally, the performance gap is closing. Qualcomm's, AMD's and Intel's latest chips might not be "M4 killers" (or M3, for that matter), but they're certainly competitive. This will only keep improving in 2025.