Talk time and the like introduces even more variables (OS version, manufacturer's test conditions), so it makes comparisons to competing devices harder. Further

Talk time and the like introduces even more variables (OS version, manufacturer's test conditions), so it makes comparisons to competing devices harder. Furthermore, if one plans to replace the manufacturer's OS with another version, these numbers become even less meaningful. On the other hand, one can be reasonably sure that a device with twice the battery capacity, same OS, same settings, SoC, display, etc will last roughly twice as long with the same usage. Comparing hardware specs across ecosystems makes little sense, since all modern smartphones are generally fast enough, so it comes down to what kind of walled garden you prefer.