I think the problem with the marble run is the constant "rrrrrrr tick-tick rrrrr tick rrrr", but aside from the noise it's a great toy and a core component of any child's toy box. It's also the start of many Rube Goldberg machines running through your living room.
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Nulls are useful, but you can't work with them in Java. Anything can be null at any time without warning, even when you have absolutely no reason to ever allow a null. Null safety as a language feature gives you the choice to allow nulls when they make sense or guarantee a value when needed. It saves you checking for nulls in the core of your logic when you already ruled them out at the boundary and enforced it at compile time.