WTH can't units like kW and W not be shown in a single graph?

Month of "What the heck?!"
1

If we know that a device_class is available such as power, why can’t it transparently converted?

2

W → power of a device
kW → power of a device (*1000)

it should be possible to display these in the same graph - it might be, that a device with 1.6 kW will cause the device with 53 W will not be visible because it would be 0.053 kw - or the other one will be 1600 W vs. 53W

What you can’t combine in one graph is W / kW and Wh / kWh.
And that’s correct, because W is the power (just right now) - and Wh is the power consumption over time.