I'm a drafter/designer who has worked with engineers for years and also designed my own fair share of parts...I'd say it's the liability issue. Overengineer something and you won't have to worry about it failing. Which in a lot of ways is good (safety and reliability), but it can also make maintenance a nightmare (as you've found) and drive up costs.
A former company I worked at designed (amongst other things) I-beam constructed baseplates ('skids'). A long time ago, an engineer had written a design guide (rulebook) for these skids such that the skids always were overengineered, and were much stronger than they needed to be. The main reason was so that dumb drafters like me could, by using the design guide, design a skid without an engineer having to approve it. It was mostly for lifting of the skids, so that there was a 4x safety factor. Hiring 10 drafters was a lot cheaper than hiring 10 engineers to design the same thing, even if you used more material.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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