I was thinking about their technology in general, especially as it relates to what they had
before The Fall, and what they developed
after The Fall. Reading through the "latest" (?) Thorpe novels had me thinking about this.
it was still meant to be the most advanced, but now every man and his dog has antigrav tech.
I think that it's reasonable (?) to acknowledge the primacy of the wargame in some of this. Everything has to be balanced and similar enough for games to be equitable given the relative strengths and weaknesses of the armies.
As it stands, "antigrav" as it is talked about in the game seems to be very much similar to the notion of the 'ole suspensors (do they still have this?). Put them on something heavy and they float. Want to make them move and you push them with something (i.e. motive power/thrust).
The Eldar in the novels seem to have "gravimetric" drives, or whatever you want to call them. Rather than just making things float (they can do that) they can actually use the drives for motive power, too. Hence their starships, spaceships/flyers etc.?
With that said, I do agree with the notion that Eldar technology
should be better than it is often represented in the game because of--for want of a better term--wargame balance (?).
Now, I realise that just because the Eldar could "make stars die," or whatever, but I would imagine that we can level this type of technology in the realm of the military insofar not every Eldar could pull a starkiller out of their sideboard. This would mean that the Craftworlds would have
commonly available technology and not some of the more advanced tech (though such would be available on the Croneworlds).
So what is that tech?
For example, some of the most advanced armour that the Eldar have is "Mesh", right? Sure, it might not be as clunky as human versions, with Eldar being able to put on, say, a bracelet and it being able to morph into a full suit of armour, but it's still mesh.
What about power systems? There's clearly something going on before The Fall, but the subsequent adoption of the Infinity Circuit and soul power is somewhat rapid (if not necessarily universal).
So what gives?
I'm just trying to figure things out once again.

...now monkeys can fire shuriken weapons and make them work better than Asurman...
I cannot comment on the last bit of that, but I do recall that in the earlier days the Imperium, and the Forge World of Mars specifically, could produce shuriken weaponry. Sure, it was less advanced than the Eldar version (it used magnets rather than grav-based technology), but of course that's not something that is generally going to show up in the wargame?