Using different method of getting there for one. The 50 year old version was more a direct flight. The new Artemis version is using a different approach that’s going to take many more days (10 I think vs 3 days). The rockets are different, the ships the crew will be in are different and untested(well some parts are tested now). We have a much lower tolerance for failures. We aren’t racing the Russians this time trying to perfect our ICBM tech in the guise of landing a man on the moon. This time we’re actually trying to set up shop on the moon. That last bit means things need to be way more robust and idiot proof. This isn’t just some task of sticking a monkey in a tin can and aiming it at a rock. This is way more advanced.
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