It is so boring to tend, water, plant and harvest all the little patchs in a plot (either public or in the house). One of the reasons I dislike any of those stupid fv-type games. Be nice to have the option to apply an action to an entire plot, esp in our house plots. It could be a benefit of one of the higher skills.
Sidenote: the same could apply to mining a rock, it you have the energy, it mines til the rock is gone.
Update: after further thought, the plot tender would only for for home use. Further experience with public plots shows it is not really needed.