Bible says that Abraham cried his wife Sarah for a month. After that he leaved the place. Later on, Bible says Abraham got married again, had concubines and lots of children. Before his death Abraham gave gifts to all his children and women and, of course, gave the best of the best to his soon Issac.
From here I have learned that yes, emotions are part of us, but we must have parameters. Abraham lost his wife, he cried for her for a certain number of days. After that, he just let go and found another woman and have more children.
This is not because he never loved Sarah but because Sarah was dead. No reason or meaning to be attached to a dead woman.
The reason of burials was "dignity".
The body of the dead person to be treated with dignity. The body not to be exposed to wild animals dismembering it, to rotten and cause possible diseases when bit by insects, and also, because religious beliefs.
Burying a man was cheap and easy millenniums ago. Covered with clothes or naked, the body was to go underground. Towns separated a land for burial, at the beginning was a no one's land.
Slowly but surely, profit was made from burials up to the current cost of cemetery plot, additional funeral services, additional cost as transportation of the survivors, and more.
To me, to be buried is enough, no matter the place. Even I consider a plus to be buried and later to plant a tree over, a fruit tree if possible, you see, I want to be productive "at last"... ha ha ha