What is the advantage for an essentially spiritual being, of temporary incarnation into this world, followed by the permanent incarnation of resurrection?

For those of us to who regard spirit as primary, as having existed first, with material incarnation as secondary and later and derivative - and especially if we believe there is a continued existence after mortal death - there is a need to explain why we are temporarily incarnated as mortal beings, here on earth. 

I suppose the "why?" comes from our belief that God the Creator is Good and loves us each individually; so that the answer must include that this mortal incarnation fits God's plans for creation and is also good for each of us an individuals. 

The problem is made even more difficult to answer by the uniqueness and varieties of individual persons, and the unique situation into which each individual is born. It is difficult to come up with both a true, and also a particular, general explanation. 

Yet the common feature is incarnation: although ultimately spiritual beings, we ourselves and this world have large material/ physical elements - despite the obvious limitations of this. 

So the question boils down to: what are the positive advantages of being material/ physically incarnated beings - living in a world with many other such beings? Including that this advantage is temporary, in the sense that we shall die, and our materialness with undergo dissolution. 

Further; for Christians, we need to explain why Jesus emphasised that after death (if we follow Jesus) we shall be resurrected...

Each individual person shall stay himself, and shall be reborn, yet not as a spirit, but instead as a "solid" physical/ material being - but this time an eternal and everlasting being that does not age, decay, or die.  

I think we must assume that it is better for us to remain an incarnate after death, that there are therefore significant advantages in being incarnated as compared with being and remaining a spirit. 

However, this matter is very poorly understood; and those who believe in the reality of spirits find it difficult to comprehend why it is better to be bounded and solid and to have a single perspective, than to be everywhere equally as a "pure" spirit presumably is. 

These may seem like strange reflections! Yet I think Christians need clear and comprehensible answers if we are to defend and explain our preference for and choice of resurrection post-mortally; over the alternatives such as becoming pure spirits, or having serial reincarnations. 

For myself, I assume that incarnation is the spiritual mechanism by which increased consciousness and freedom are manifested as the purpose and direction of divine creation. 

That the two go-together: that it is by incarnation that we become more free, more self-aware, more ourselves. 

Further; that these are also attributes of God the Creator, and of Divine Creation - such that Creation is directional - away from pure spirit and towards incarnation; and that this is the intention of God.

I assume that at first there can only be the kind of temporary and mortal incarnation which we experience here-and-now; but that the ultimate goal of God via divine creation is the eternal incarnation of resurrection - which was and is possible by the work and gift of Jesus Christ. 

Thus the answer to "what is the advantage" of mortal incarnation; is that it is a necessary step towards Gods purpose of a creation characterized by increasing consciousness and freedom.