Nothing wrong with doing it for aesthetics. Of course, if that is the reason, you can just not harvest everything. Out of all the crops, I use fewer than half of them. Mushrooms, potatoes, and corn are really the only things I use most of the time. I'll sometimes grow other things, especially to complete the challenges, but I rarely use them even if I just find them. I have no interest in searching for eggs all game, so I stop gathering them once I am past bacon and eggs. I see no reason to spend my time gathering them to cook pies and stuff with blueberries or pumpkins. I don't have coffee or tea, so have no reason to grow those things. I don't craft aloe cream, so don't need that. And so on. I'll plant trees sometimes, but those don't require farm plots or normal harvesting anyhow.
And I am sure anyone planting 400 crops is also not using all of them. Harvest only what you use and let the rest stay grown, imo. And the idea of planting that much super corn to sell that some people do just seems cheesy and pointless since money is so easy to get and not really needed for much.
I will say that being able to clear grass quickly would be nice. I've given up on cutting all the heads around my bar because of the time it takes, but I would like having a way to do that quickly. I just don't think it should be a way to get a ton of grass in seconds or minutes. I would be happy to have a way to cheat all grass within the land claim with the click of a button while getting no grass from doing so.