I’m sure the “lawn” you are talking about is just a field, not the meticulously manicured, evenly green, golf course worthy lawn decorating front yard of a house in a development where the HOA gets their panties in a wad over a couple of dandelions in the grass. 
We are in the PNW, where it rains a lot, so you would think no sprinklers needed, but no… grass would go yellow if not watered in the summer. Developers put grass down because it is so much cheaper than planting shrubs and trees… folks assume that is for aesthetics. Lush greenery!
And your lawnmower… it was already manufactured so that ship has sailed. No need to throw out something that works fine. When it dies for good… that will be a different story.