It took far too long for Microsoft to release an upgradeable (and partially repairable) Surface. Even then, on the few recent devices with the capability, it's just the SSD that can be replaced. However, the tiny M.2 2230 drives that Microsoft chose are hard to find, with upgraders having to scavenge them from USB SSDs and from Xbox X and S storage expansion modules. 

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I'd bought a Surface Pro X shortly after Microsoft launched its ARM-powered hardware, picking a relatively small 256GB option with the intent to eventually upgrade to something a bit heftier. But the complexity of tracking down a suitable drive meant it remained one of those "someday" projects. 

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Then "someday" arrived, with the recent appearance of M.2 2230 drives on Dell's parts site