I think you're missing the point focused on your point. We all understand the internals are probably coming from the same factory line. The problem is that they don't connect universally. As someone up the chain elsewhere stated, if the markets can be forced to use the same USB charging port, there should be a similar regulation for these kinds of things as well. Whether that's a universal battery shape/connector for tools, eBikes, whatever. We've unified things like 110v mains plugs, 220v mains, etc.

The fact that they do all use the same internals makes this even more egregious.