How about using Falcons in the 4-strong aspect troupes in the alt-lists? That seems like a less points-restrictive option, but does it fair well?

For example, 2 shining spears, 2 dark reapers and 2 falcons. For 305 points, it doesn't seem that great, even if it has above average shooting ability.

So, does the point cost of a falcon as transport seem too high at both ends of the spectrum [small formation to big formation]? What about in the 6-strong formations of some of the other alt-lists?

You can't do that with WE transports.  It takes a minimum of 2 activations in 2 separate turns to pick up and drop off infantry.  First, the mounting formations has to board using their action, then the combined/loaded WE can activate in the following turn.

If you allow joining/embarking and disembarking/breaking up in the same turn, it causes wonky results with every method anyone ever brainstormed on the playtest boards - formations double activating, moving faster than if they had organic transport, effectively free and unlimited combined assaults, etc..  Bad mojo.  You might be able to house rule it for friendly games, but no one could figure out a way to write hard rules for it that didn't have some sort of exploitable loophole.

Am I missing something?

As Nealhunt has pointed out, allowing transports to carry other formations opens up very abusive situations.

As an extreme example imagine a falcon troop picking up the exarch survivors from 4 aspect warhosts.

The falcons could then do an assault with 8 inspiring characters without even using a commander character surely players can see the abusive side of that.

It has been attempted to work a rule in that allows transporting other formations but so far it's been impossible to get a rule that cannot be abused in some way.

I would like to move this problem to the main Epic Armageddon section instead of just the Eldar. Maybe more people will read it there.

That's easy:

A formation capable of transport may only carry troops from one formation at a time.

Hey,

I was wondering how often you guys see the falcon transport upgrade taken for Aspect hosts.

I don't think I've ever seen them taken. For me, it's often a case where they seem like they would be a cool addition, but I can never justify reducing my number of activations.

Does anyone think they cost too much?

Where is this new thread? I posted there once but now it is gone?

His thread, his prerogative.  I think he was too emotionally committed to the idea.  It didn't matter what anyone else was saying, he was sure he was right and everyone else had to be wrong.  Been there, done that, and it ain't pretty watching somebody lose it over a silly game rule.