I was glancing at a number of classic X-men covers in the original series, all drawn by Jack Kirby. It occurs to me that if you allow these scenes to animate, that is, in your minds eye, they were more than carefully composed.... they were cluttered.
I think what occurred to me was "What an odd assortment of characters these original five students were."
Think about this for a minute. You have five, maybe six, team members that all had to coordinate their powers and attacks without getting in each other's way.
Now, Professor X didn't often get into the action, preferring to sit off to the side and direct his students' efforts mentally.
But consider the others: You have Marvel Girl who basically stood in one spot, but occasionally might levitate. Cyclops fired beams from his eyes, so if he turns his head, his beam "sweeps out an arc"... woe to anyone standing in that arc, friend or foe!
Hank is a tremendous athlete nimble and tumbling, swinging off limbs, flagpoles, bldgs, etc, but able to dodge quite well.
But then we have Bobby, who is forever creating ice slides, ramps and roller-coaste tracks of solid ice, that block the path of all others....wheelchairs or two legged team members alike.
And finally, we've got the Angel...whose 10-12 foot wingspan maybe impressive in a single still shot, but for all the time that Warren is aloft, he's got to be beating these huge things, and so, when working in close quarters, he's got to be occupying a large airspace.
Even in the original number one cover, Warren is there in the thick of it, flapping his wings in the middle of his teammates.[X-men #1]
Also, note how many times he's being grabbed by the wrist by a villain! (Is he really that easy to snag?)