[z9znz]

> 1000x times simpler/redundant propulsion technology

This is a contradiction.

A system with that level of redundancy will have a corresponding increase in complexity of management systems. That means software (multiple copies of software on multiple independently powered computers all somehow coordinating). This makes the management software the single point of failure, and frankly I'd sooner trust a 50 year old pair of mechanical engines to a 5 year million line of code program.

[momenti]

You can always build things more safely with more resources (more maintenance, more checks, more testing etc.), the question at the end of the day is whether it is economical. I don't think this question can be answered upfront in this case.