Not really knowledgeable of the specifics: Is it really currently unfeasible for a repair shop to figure out how to re-solder a new SSD, and "flash" the T2 chip?
Apple Silicon macs lack T2 chips, and you cannot "resolder the SSD" on modern Macs, really, you'd need to resolder 8-16 chips on the actual main board, make sure they are the right kind of chips (not something Apple will tell you), and then pray it works --- did it fail because there's a proprietary process of pairing SSD chips to the motherboard, or because one BGA ball on one of the chips didn't sit correctly? Or because it was the controller that died? It's a nightmare to test and pinpoint, you're better off replacing the thing.
There was a video of Louis Rossmann where he explained why he didn't want to do component level repairs on new macs if it was RAM or SSD. I trust his expertise on the matter.
