the /respawn command would teleport you to your spawnpoint.
We don't need that, we have compasses that point to your spawnpoint. (You might need to use /setworldspawn though.)
Making note of safe coordinates at one's most current respawn and using /tp essentially covers this.
Setting keepInventory to TRUE and dying offers another option.
Given these options, I don't see a need for this addition.
WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.