Yet every other parable Christ gives is that we might know the spiritual Kingdom of God is here,
And Jesus' analogy with the fig tree speaks of the kingdom of God being near, not here. Summer is near is not = summer is already here.
The context of Jesus' analogy is what the apostles wrote:
Luke 21
25 And there shall be signs in the sun, and in the moon, and in the stars. And on the earth will be anxiety of nations with perplexity; the sea and the waves roaring;
26 men fainting from fear, and expecting those things which have come on the earth. For the powers of the heavens shall be shaken.
27 And then they shall see the Son of man coming in a cloud with power and great glory.
28 And when these things begin to happen, then look up and lift up your heads, for your redemption draws near.
31 So also, when you see these things happening, know that the kingdom of God is near.
30-31 Behold the fig-tree and all the trees. Now when they sprout leaves, seeing it you will know that summer is now near. So also, when you see these things happening, know that the kingdom of God is near.
Christ very clearly tells the disciples how we shall recognize His coming again.
Exactly. And part of that is what He tells His disciples about the end of the Age, which includes the analogy of the fig tree.
You're mixing it up with the entire Age since Pentecost, i.e with everything that comes before the end of the Age.
Before He tells them about Him coming again, He speaks of all that shall come to pass during this age of Gospel grace.
"Every day Jesus was teaching in the temple courts, but at night he went and stayed on the Mount of Olives." (Luke 21:37).
"And Jesus went out and departed from the temple. And His disciples came to Him to show Him the buildings of the temple." Matthew 24:1
Despite the disciples' question regarding the Jerusalem temple, in all three synoptic gospels the very first thing Jesus began speaking about (after He had sat down on the Mount of Olives) was (a) birth-pain signs leading to the time of the end, followed by (b) telling His disciples a great deal about the persecution and tribulation they would face for His name's sake, followed by (c) telling them about a tribulation that would immediately precede His return.
In-between He also gave them the sign that Jerusalem (not the temple) was soon to be destroyed (Luke 21:20-24).
But here's the context of Jesus' analogy with the fig tree - the tribulation in the days immediately preceding His return:
Matthew 24
29 And immediately after the tribulation of those days, the sun shall be darkened and the moon shall not give her light, and the stars shall fall from the heaven, and the powers of the heavens shall be shaken.
30 And then the sign of the Son of man shall appear in the heavens. And then all the tribes of the earth shall mourn, and they shall see the Son of man coming in the clouds of the heaven with power and great glory.
31 And He shall send His angels with a great sound of a trumpet, and they shall gather His elect from the four winds, from one end of the heavens to the other.
Luke 21
25 And there shall be signs in the sun, and in the moon, and in the stars. And on the earth will be anxiety of nations with perplexity; the sea and the waves roaring;
26 men fainting from fear, and expecting those things which have come on the earth. For the powers of the heavens shall be shaken.
27 And then they shall see the Son of man coming in a cloud with power and great glory.
28 And when these things begin to happen, then look up and lift up your heads, for your redemption draws near.
31 So also, when you see these things happening, know that the kingdom of God is near.
30-31 Behold the fig-tree and all the trees. Now when they sprout leaves, seeing it you will know that summer is now near. So also, when you see these things happening, know that the kingdom of God is near.
Luke 21:32-36 (KJV) Verily I say unto you, This generation shall not pass away, till all be fulfilled.
Reading the Olivet Discourse as though the words of Christ can only be for a single generation, whether at the beginning of taking the message of Christ unto all the earth, or at the end, lacks understanding of how Christ speaks to His people in every generation of things that will come upon the faithful saints as we tell others of the spiritual Kingdom of God and how entrance into His Kingdom comes when we hear the Gospel and are born again of His Spirit in us. And that if we do not enter the spiritual Kingdom of God during this age of Gospel grace, then we shall be of those whose names are not found written in the Book of Life who are then cast into the lake of fire, that is the second death.
The Olivet Discourse indeed speaks to those who were His audience, those who would come after, and those who will see His return - but just because this is the case, does not mean that it isn't obvious by the context of the surrounding part of the passage that Jesus was speaking only of the days immediately preceding His return when He used the analogy of the fig tree.