You ever see a dog that’s got its leash tangled the long way round a table leg, and it just cannot grasp what the problem is or how to fix it? It can see all the components laid out in front of it, but it’s never going to make the connection.
Obviously some dog breeds are smarter than others, ditto individual dogs - but you get the concept.
Is there an equivalent for humans? What ridiculously simple concept would have aliens facetentacling as they see us stumble around and utterly fail to reason about it?
When people say “4D” they typically mean four spatial dimensions, in addition to time. You’re not being clever, you’re misinterpreting the context.
We’re not even quite sure yet that time is actually different from space. All research seems to suggest they are sides of the same coin.
Depending on how you look at it, considering time a separate dimension at all just seems silly.
Then again, this is just some more context for your context.
https://youtu.be/xIarrG9ZO4I