I would strongly suspect that there is absolutely no technical justification for this decision at all. This was a political and marketing decision, to punish c

I would strongly suspect that there is absolutely no technical justification for this decision at all. This was a political and marketing decision, to punish customers who use third party devices. This falls neatly into line with Apple's agenda. Apple refused to support TRIM on SSDs, unless you make on small patch to their kext. I would imagine that there is something similar for this feature.