I don't know if they existed at design time, but hydraulic fuses could have prevented draining of all the fluid. That makes the design take longer, increases w

I don't know if they existed at design time, but hydraulic fuses could have prevented draining of all the fluid. That makes the design take longer, increases weight, introduces new scenarios such as the fuse activating when it shouldn't, increases cost, and increases maintenance & parts (cost of ownership). As with these matters there is no one true correct answer, but rather a very complicated set of tradeoffs and probability estimates. In hindsight it is easy to see designs as defective, but they could all be done in good faith.