Also they need to work day in, day out, for years, not just a couple of times. Which can sometimes end up in James Webbification, as the more expensive and rob

Also they need to work day in, day out, for years, not just a couple of times. Which can sometimes end up in James Webbification, as the more expensive and robust it gets, the more likely it's the only one and the higher the stakes if it breaks. So you make it more over-engineered and expensive.