IIRC, there are already some mods where people created lawn mowers. I think they only damaged certain block types (grasses) so you didn't end up half-destroying your lawn and having to run around repairing the dirt which is SUPER annoying.
So yes, this IS a zombie survival game but people like taking pride in the way their base looks. At some point, the game's progression (for the player) will wind down to the point where seemingly trivial things like landscaping will be an important part of enjoying their base that already has everything. There's nothing wrong about people asking for seemingly small things like this. Customization leads to engaged players.