In The Original Series in the 60s, people had no idea what the future would look like or what technology would look like. In one of the early episodes, they had a paper print out machine on the bridge that looked like a fax machine, which was considered futuristic in the 1960s.
Like the example of the Enterprise fax machine, what technology or system do you think are we displaying in the current Star Trek shows that will show how dated we will become in the future?
They do have a morgue on the Enterprise D, so presumably they just keep bodies there before they go through whatever death rituals the society has.
or if they wait too long … they just dump you into the replicator and Picard gets to drink your former atoms as his daily cup of hot Earl Grey tea.