Using such information is so hard that almost impossible. I could spend a year tailoring battery performance for a messenger and still get random guy who have some exotic phone with some strange behaviour.

There are really almost no need to run app in the background or at least constantly send data without a reason (mostly just tracking).

UPD: When deciding how to build something i have one small trick: first ask question about who can make better decision about something?

For example? Who is more capable to make decision about battery usage, about tweaking core performance, etc? It is obviously kernel or silicone itself. App will never have required information to build perfect performant app for every device. This just means that you have to build a kernel by yourself and even more: common kernel for every phone.