Exactly, IF the connection between removable SSD chips and the T2 chip was the weakest link, the SSD chips can be desoldered anyway for any determined hacker. Besides, the Mac Pro isn't considered "unsecure" despite the use of socketed SSD flash chips. It's actually more secure and more environmentally friendly as if a business/government needs to wipe the computer, they can just remove the memory chips and destroy them and be able to use the machine for something else. As of now, you would have to destroy the whole logic board for that.There's no weak link in something like BitLocker or any of the other enterprise-grade drive encryption software products out there that don't semi-permanently lock the drive to the logic board's security chip. That's why it's in use by the military and the federal government. No need whatsoever for this degree of hardening.
Soldered SSDs in a desktop is a plain money BTO money grab and ease of assembly for Apple. NO BENEFITS AT ALL FOR THE END USER....