Sometimes that's real, sometimes not. Most times not IMO. It really creates a lot of confusion IMO to jumble things all together. How can we really understand what GOD is saying to us if we really don't understand the message GOD was speaking to others? There's always a message there for us, but many times the prophecy doesn't concern us at all, and trying to make it do so is a distraction and confusion. For example, what does Isaiah chapter 3 have to do with us? Nothing. We can still derive spiritual benefit from it, though, by understanding how GOD deals with his people who disobey.
As far as a confusion and things being all jumbled together, it appears that, regarding future things, it is God Himself who has jumbled it together in a sense.
Take the famous Isaiah passage. Unless Jesus had stopped reading where He did, we would not understand that God spoke to the prophets sometimes by saying something that would occur and in the next breath, saying something that would occur much later.
We can't see that this is occurring in many verses - not just the famous Isaiah verse.
It would be like me saying, I'm going to the store and I'm going to Florida. You might think I'm saying I'll do both those things today, when really I'm going to the store today and then I'm going to Florida in August. And then I might further say, I'm going to Pennsylvania, and the trip to Pennsylvania might be BEFORE the trip to Florida.
And I don't think God is purposefully jumbling things (though there is some element of sealing up until the time of the end) but He sees every point in time at once while we don't, so we go from A to B to C, whereas He can go from A to C to B.
We see linearly. He sees the whole line at once.