Alma 42:8

Now behold, it was not expedient that man should be reclaimed from this temporal death, for that would destroy the great plan of happiness.

God is not in a hurry to relieve us of temporal death, for it serves a useful purpose. It allows us to be mortal and to experience mortal time. With Adam's fall, life had a beginning and an end, and time became linear. We could thus have distinguishable pasts, presents, and futures. We could repent and put things in our past. We could exercise our agency in the present in the hope of creating a better tomorrow. Without a beginning and an end with linear time in between, we could not repent, for our sins would be ever in the present tense. God needed us to experience time as part of our mortal probation.

Alma 14:11

But Alma said unto him: The Spirit constraineth me that I must not stretch forth mine hand; for behold the Lord receiveth them up unto himself, in glory; and he doth suffer that they may do this thing, or that the people may do this thing unto them, according to the hardness of their hearts, that the judgments which he shall exercise upon them in his wrath may be just; and the blood of the innocent shall stand as a witness against them, yea, and cry mightily against them at the last day.

While we are constrained in our understanding of life by the limitations of our mortality, God sees life and death differently. Death is not the ultimate evil many think it is. Physical death is not the end of life from God's perspective. It is just a transfer. He will not save everyone from death. What to our finite minds is a tragedy, is not tragic to God. It is simply his plan. How long we live and the circumstances of our death are entirely under his control. If we are being faithful, we need not fear that our death is untimely or unfair. God is never surprised when we show up on the other side of the veil. God does not have to save us in mortality because Christ has already saved us in eternity. The end of life here is merely a step towards the resurrection and immortality to come. Losing a loved one is not easy, but it is not the end.