@MrGimper the "issue" with the soldered SSD's is that if it fails outside of warranty you're stuck buying a new laptop, unless you want to pay an outrageous price to fix a machine that is 3+ years old (because, let's face it, it would be silly to buy one of these without the 3-year AppleCare plan).
Of course - the other "issue" is that if another component on the logic board fails while under warranty you also lose your data as the storage is built in.
It's not that people are saying 2.5" SSDs don't fail, it's that the risk of data loss is higher when the SSD is integrated with other components that could fail.