It’s been that way since Apple started soldering storage back in 2015 (MacBook) and ramped it up in 2016 (MacBook Pro).So if the SSD fail (after the warranty), then there's no way to repair the Mac Studio (from some repair service shop) to change its SSD, right? That sucks!
MaxTech did a teardown and the storage is socketed. It’s proprietary, but not as dire as soldered storage.