The SSDs used in Macs outclass most other offerings. It's not fair to compare them with random SSDs on price alone, you need to compare with the best the market has to offer. The gap used to be an order of magnitude even against the 'best' SSDs commercially available. This is why they initially used their proprietary interface, then NVMe. The gap is getting smaller but it is still significant. And that's against SSDs you can buy - not the SSDs other companies will stuff on their laptops.

What rubs me the wrong way is that Apple outfits all their cheapest devices with unpractical storage sizes, so you are essentially forced to upgrade.