In terms of ‘actual successor hardware existing’ Apollo era hardware isn’t antiquated, since we largely didn’t bother to ever build any successor hardware; but at a component and manufacturing level, there have been some significant changes.
Take this story as an example: the concept could hardly be more ‘everything Apollo is new again’; but the sheer number of changes in design, fabrication technique, and other details, even when handed the goal of ‘Yeah, dust off a vintage F-1 engine and build a new one.’ is pretty significant.
