Ideally yes. The makers and inventors of this world should be working on this.
We've had standardized batteries for a very long time. From the alkaline chemistry AA & AAA batts that have been ubiquitous as long as anyone can remember, to newer standardized cells based on lithium chemistry like 18650, 21700, etc.
But people tend to prefer the higher capacity for the same size (or smaller size for the same capacity) that is afforded by custom batt shapes designed specifically to fit into devices with shapes other than cylindrical.
Further, companies making devices don't want to use standardized batts because they would rather 1) rely on the additional revenue source of custom batts and 2) have direct control over the quality of the cells being used in their device, even if they use standard sized cells in their unique battery assemblies (which is what you see in most camera batts.) The latter should be obvious after you do a quick search on Aliexpress and look at just how cheap and junky/dangerous of a no-name cell you can buy. While the former you may be annoyed about, tough; it is the manufacturer's prerogative to maximize profits. Don't like it, don't buy the device. If enough people really had an issue with this, one or more of the camera makers would sell a body that directly accepted something like a pair of standard 14500 cells. But none of them do, because most people don't really care enough.
