But is is no question: the Apple Silicon chips sip power. If you're looking to minimize watts consumed, a MacBook Air is still on top (or bottom), even if OS X has many pain points too.
The untapped energy savings is, IMO, getting people to run their climate control less. We should toughen up a bit, tell our brains that 50F-80F is the comfortable range. (Depending on humidity and your workload).
If we’re looking at choices a person can make, every choice is multiplied by millions when applied to the entire population of a country, so the 1W differences are swamped by the equally scaled 10W differences.
If we’re looking at the things we can do to reduce our individual consumption, it absolutely makes sense to prioritize the things which are large relative to our other individual contributions, first.
Of course it depends on the computer, but if we're talking laptops or corpo computers it's like 25 - 50 watts. Supercomputers, like those used for AI, are different of course.