At least on construction equipment (agricolture may be different) the point is not only about costs (and frequence) of repairs, but rather on machinery down tim

At least on construction equipment (agricolture may be different) the point is not only about costs (and frequence) of repairs, but rather on machinery down time or production loss. I have managed in the past some high production sites (road tunnels) with a specific sequence of operations and having a jumbo or a wheel loader or an excavator down meant severe delays not only in excavation, but on all the following works (concrete pouring, impermeabilization) and on all the "ancillary" works (ventilation, electric cabins moving, etc.). One of the machine at the excavation front broken for more than a few hours would have meant literally days of delays, complex scheduling modifications, etc., a total mess.