Sure it's not upgradable but you're completely wrong about repairability, unless you're talking about micro component repair ala Louis Rossmann, which as a whole is going the way of the Dodo.
I mean sure if it has to do with CPU & memory & storage there's probably little you can do except replace the SoC, but it's also the least likely component to fail. Everything else is a removable module and pretty easy to replace, it's one of Apple's best repairable laptops. It'll also be a parts bucket with how much volume is sold, so genuine parts should be easy to come by on the aftermarket if you don't go through apple self repair program directly.