You make it sound like Windows needs to be fine-tuned (by the vendor) to provide good battery life. This is absolutely not the case. You install a bare Windows 10 on a random laptop, and battery performance will likely be much better than on Linux.
Anecdata, but my desktop Lenovo workstation's suspend function worked well with Linux, but after an update (few months ago) it never resumes successfully. Nothing in logs -- just simply doesn't wake up properly. (4.10 kernel.) These are painful things.