I think under market conditions you would be continuously tweaking the model, and manufacturing processes, based on feedback eg wrt robustness, comfort etc and

I think under market conditions you would be continuously tweaking the model, and manufacturing processes, based on feedback eg wrt robustness, comfort etc and also taking into account changing usage parameters/expectations, changes in material supply costs, regulatory requirements etc Of course these concerns matter more if you’re making a lot of these “widgets” but even in the case of a one off you’re going to have servicing costs and the occasional redesign/replacement/upgrade ... It’s not that far out of line with software - widely used products go through tight highly iterative development cycles whereas one off solutions tend to be just “good enough” with bug fixing and the occasional feature request.