It didn't make sense that you couldn't make them out of iron or steel, and spears were previously balanced around the damage of bronze spears.
Wouldn't it make more sense that this was done to change greenhouses? Currently, you can climb a mountain, mine the glacier, and build an ice greenhouse that will never melt no matter how warm the place you build it is. It was a neat little trick people do to save glass, but it was silly.
No, obviously this was done to add more depth to the mechanical power system. It makes sense that you can't just keep increasing the speed of the system without eventually exceeding the limits of the wooden parts. Also, as the dev blog stated, the plan is for higher tier mechanical parts to be introduced which will let you push beyond these limits. Nobody is forcing anyone to update, if you don't want to change your gearboxes, nobody is ruining your build. Also, I would say adding large windmills and water wheels is definitely some kind of compensation.
Your post is total nonsense. This game has a great community, for the most part, which doesn't need histrionic pessimism like this.