Okay, so soldered DRAM = GOOD, unless someone charges too much for it, then BAD and soldered STORAGE = BADSoldered DRAM is only really bad if they don't make the memory upgrade cost comparable to aftermarket upgrades.
I hope you know why soldered storage is bad, please spare me the "you should have backups" argument, because we all know how that goes..... even with the largest of corporations.
Storage SHOULD NOT be soldered on a laptop or desktop computer for any reason.
You should have backups, because soldered or not, when storage goes, you're screwed. More screwed with replacing a logic board, granted, but you're equally screwed with no data.
My opinion, which I have mentioned in earlier posts in other threads, would be for Apple to settle on a physical format that they can use for all of their portable line and Mac mini moving forward that is socketed, similar to the iMac Pro and Mac Pro form factor and Apple have an official trade up program for storage within the 5-7 year period that Apple supports a given computer line up.