Multiple orders of magnitude? Do the rockets/engines today look anywhere close even to a single order or magnitude better than before? The computers are much b

Multiple orders of magnitude? Do the rockets/engines today look anywhere close even to a single order or magnitude better than before? The computers are much better yes, but not good enough yet to obviate the need for real engine testing and wind tunnels for aerodynamics. Computers in the 70s were already capable of landing autonomously on other planets - as demonstrated multiple times.