That's malarkey. EVs have more than enough space for a donut. If manufacturers choose to not ship one, that's because they can same $$ and weight by not doing so - it's not due to space.

I drive a compact PHEV and there is literally no place to even put a spare, but that may be more because it's a PHEV and so it has to make room for both batteries and engine. I know most compact EVs don't come with spares and many don't even have a well to store one in.