> You’re listing things that are high powered and or old.

Sure. I have high-powered and old things, and I bet you've seen stuff like that too.

I'm explaining why I, as a non-expert, would not put 146V into something that says it can't take more than 150V.

> People generally are not lugging white goods internationally

Travel doesn't enter into it; My appliances came from Europe, they're just labelled a bunch of different voltages, so I think voltages within that range are roughly equivalent.

Furthermore, British have such a very special relationship with tea, such it would be entirely understandable that a Brit would take their kettle with them and often become quite annoyed that they cannot get an adapter to use it when holidaying amongst the yanks.