Sorry to hear about the lossses. It even stinkier to lose two trees of the same kind of fruit together. It seems apricot trees and unexplained death are not uncommon.
I don’t have an apricot tree so I grafted apricots on my peach and nectarine trees. Some in 2016, more in 2017. They have grown like weeds. Not all apricots are graft- compatible to peach rootstocks, though.
What I like is how fast they produce flowers, the next year of grafting.
What I don’t like is how early they flower considering fluctuating temp we have had.
Re.jujube. I love the taste of honey jar and sugar cane. Not so much of Shanxi li as they tasted drier and spongier but I hope taste will improve as the trees are maturing. If you have an Asian market nearby, you may want to look for them for your family to try. My husband and my daughter do not like the taste. Well, there are more for me My Asian friends all love them.