The PlayStation 5's built-in SSD is fast, but you can fill it up fast, too. Using this guide, you'll install a separate M.2 NVMe SSD to increase your game console's storage without taking a speed hit.
If you won't have any space issues on your 500GB drive (and it doesn't sound like you will since you're only using half of it right now), then it makes more sense to leave that OS X installation on ...
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