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Engineer who's been skating with spacers since 94 here, they're not designed to crank down so it's a solid connection the whole way through, they're designed so that when you tighten your nuts the normal amount they restrict how much lateral deflection the wheels can put on your bearings when you put any force on them that isn't in the regular plane of rotation. Because urethane is really quite soft when you power slide or nose or tail slide or revert a landing you're able to push the bearing somewhere it doesn't want to go, equivalent to tightening down the nut so far it won't turn. Once you stop doing that and start rolling normally again it goes back to where it was, but it's been damaged slightly. Spacers limit how much deflection is possible (say 0.5mm instead of 2-3mm) which keeps your bearings from being damaged as easily. If you just tighten them like you would without spacers you get that protection and it doesn't sound or feel any different. 👍

I don't know why I'm laughing at this break up scene 😅 ... it's a sad thing that could happen with anyone