I know there's alot of threads on the coatl already, some of which use pretty hyperbolic language that it's hard to agree with them, but I think the Coatl needs a large rework at some point, maybe when lizardmen get there update in game 3.
Gameplay wise it should have a grounded animation. Right now it floats above ground as its stuck motionless and turns on it's axis with no animation whilst infantry stab at thin air below it. As others have pointed out it's ugly but also makes it hard to see what it's doing when zoomed out, if it's flying or on the ground. Itd be sad to lose the animations it uses currently, qs they're really impressive, but it'd be better if it slithered like the tomb serpent animation. Give it a slithering ground animation, and then use the existing animations as a "leaping" attack animation like what the jabaslythe uses.
The next bit is the look of it. So far this series 99% of the unit models have been unanimously praised, i can only this of stone trolls and bear sleds as being dissapointung in design, but theres alot of people, including content creators like loremaster of Sotek and Mandaloregaming, who have big issues with this model. Its not that the unit looks bad, but it just isn't right, its hard ti distinguish it's faction and if you asked a fan of wathammer what it is I'm not sure they'd say a Coatl except fir it's twin tail. Lizardmen fans have been wanting this unit for a while and had a clear idea of what they wanted, a snake with wings and some feathered plumage and lizardmen ornamention.
So please CA, think about going back and looking at this unit again, and whilst your at it maybe stone trolls too. I'm not expecting it immediately but please consider updating it.