The Point of End Walker is Hope not Dispare
Zenos has never had the goal to kill the WoL,
From the very first solo fight with Zenos to the (6.0) fight.
(I doubt Zenos is actually dead)
Zenos has always pushed the WoL to become stronger,
This was no different.
Allowing us to relive what zenos went through,
fighting as a weak imperial soldier to reclaim our body just as he did.
Although, our soul was not entirely moved from our body.
Only the conscious part of our soul was moved into the imperial.
Scions where rightly on guard when (you) walk up,
Y'shtola is instantly wary of who ever it is but
not confident due to corrupt Aether in the area.
In a prolonged fight Zenos would probably beat the Scions.
The Scions are not so weak they would cave that quickly.
The End of Shadow Bringers and early parts of End Walker story
prove that they are much stronger than before.
(Maybe you forgot they literally fought full primals in teams of two?
Just before End Walker started)
The goal of End Walker was Hope, Not despair.
Ultima thule was a perfect example of that,
The MSQ was short and precise in Ultima thule,
Naturally giving the feeling that there is no chance the scions stay dead,
or at the very least things will work out the way they should.
We as the player knew it would be a good ending despite how sad the story was going.
Is that not the very definition of Hope?
End Walker is the end of a poem to the players of FFXIV,
Lastly this is a Teen rated game, FFXIV works very hard to keep it that way.
If you want a game of true dispare, FFXIV will never be it.