Good day,
I am a little late on joining this discussion, but nonetheless I joined in.
I think what must be taken into consideration is the role of these aerial entities in the movie, in the classic BFME game, in the Edain mod and perhaps the view of the team on them and what kind of role the team wishes to have for them.
In the movies, they were primarily used to disrupt unit formations and cause terror and panic amongst enemy ranks and in the siege of Minas Tirith, we could occasionally see Fellbeasts disrupting trebuchet crews.
This is also largely what they did with them in the most recent Edain patches and that's (largely) the role they perform as of now. One could say that it is simply a change of role and we have to adapt since we are so used to them being strong against most entities.
However, I do think they need a slight little boost, since the damage they deal to siege engines and buildings has not been nerfed, it has practically been gimped to the point of being questionable. It takes them ages to even remotely damage a building. I think a squad of ork labourers does more damage (I'm exaggerating ofc) than the aerial units against buildings and siege engines.
I do think a buff is in order, if only a small one, since it will force the opponent to react, forcing the siege engines to relocate and your opponent to move his archers to defend the building against aerial threats.
However, I do not think that they are useless. I think their attack frequency is spot on and I find them to be very useful in dealing with blobs. A decent opponent will be forced to react instead of taking massive losses from them, so they are already effective as both disruption and a psychological threat, but maybe just a little on the underperforming side. They don't need to take down a building on its own of course.
All of this is neatly counter-balanced by the fact that they have relatively slow attack speed, are very vulnerable to arrows, take massive damage from single target abilities and, in the Eagles' case, possess a timer.
I hope the team will at least consider some of it.
Kind regards.