I hear you; personally—for all it matters lol—I’m not against a lower power CPU with a large screen; I wish they would have offered a 14” MacBook, and was very disappointed when the cancelled the 12”.
The problem is that Apple needs a certain average selling price across all the various configs of the 16” to make their margin. So the question boils down to, would you be willing to pay $2,499 for that CPU as a base model, i.e. the same price as the much more powerful 45W entry level. And would there be enough demand to make it a viable option?
There are also technical issues in this specific case, since the CPU you propose is in a different package (BGA1528 vs. BGA1440) so it means engineering a new motherboard; that alone makes it a non-starter.
In any case, it would sure have great battery life, even if they ran it at the TDP-up of 25W. But yikes it’s got a 1.1GHz base clock. That’s kind of brutal. 😬 (Though with the cooling capacity of the 45W CPU, which has a 2.6GHz base clock, they could probably do better than one might think, especially at light to medium loads.)