I certainly won't quibble over the minor differences between Kairos and Kairos SE. They are both superb soaps. I have a water softener, so I do not have to contend with hard water. That might make a difference. Both Kairos and Kairos SE provide sufficient cushion for me to get a shave free of irritation; but I do love the luxurious feel of Kairos SE when applied to my face. I consider Kairos SE to be the best soap I have every used, but there are some others that come close.
As far as the delay in the Kairos SE release, remember that Mohammad operates alone. He does not have help with the development, production, or shipment of his products. Releasing 11 Kairos soaps at one time is a huge undertaking. He needs to get most of those soaps shipped before he can begin production on the next batches.
Mohammad has received many requests for matching aftershaves. The next Kairos SE release will come with matching aftershaves. I do not know whether he plans to sell the soaps and aftershaves separately or as a matched pair. Since Mohammad tends to create new scents for every release, my gut feeling is that the the aftershaves will sell only as part of a matched set. I am hoping he makes more soaps than aftershaves so the soaps can be sold separately. I rarely use aftershaves, but might try one of them just to see how good it is.