That's not the problem (at least for me). On an Apple keyboard the right edge of the X key aligns with the right edge of the command key, which makes it easily

That's not the problem (at least for me). On an Apple keyboard the right edge of the X key aligns with the right edge of the command key, which makes it easily accessible by your left thumb from a resting position. Most non-Apple keyboards use a layout where the command/alt key is half a key width to the left. It doesn't sound like a lot, but it makes those keyboards really uncomfortable for me to use.