Did a special nejd horse exists?

The horses from central Arabia, the Nejd, are legendary until today, but did a special type of Nejd horse exist? Palgrave was the first and only European to see the famous stud of Feysul al-Saud, often mentioned in the Abbas Pasha Manuscript. His account on it and on the Nejd horses in general became nearly as famous as the horses he saw:

“About half the royal stud was present before me, the rest were out at grass; Feysul´s entire muster is reckoned at six hundred head, or rather more. …. Never had I seen or imagined so lovely a collection. Their stature was indeed somewhat low, I do not think that any came fully up to fifteen hands; fourteen appeared to me about the average, but they were so exquisitely well shaped that want of greater size seemed hardly, if at all a defect. Remarkably full in the haunches, with a shoulder of a slope so elegant as to make one, in the words of an Arab poet, “go raving mad about it;” a little, a very little, saddle-backed, just a curve which indicates springiness without any weakness; a head broad above, and tapering down to a nose fine enough to verify the phrase of “drinking from a pint-pot,” did pin-pots exist in Nejed; a most intelligent and yet singularly gentle look, full eye, sharp thorn-like little ear, legs fore and hind that seemed as if made of hammered iron, so clean and yet so well twisted with sinew; a neat round hoof, just requisite for hard ground; the tail set on or rather thrown out at a perfect arch; coats smooth, shining, and light; the mane long, but not overgrown nor heavy; and an air and step that seemed to say “look at me, am I not pretty?” Their appearance justified all reputation, all value, all poetry. The prevailing colour was chestnut or grey; a light bay, an iron colour, white, or black, were less common; full bay, flea-bitten, or piebald, none. But if asked what are, after all, the specially distinctive points of the Nejdee horse, I should reply; the slope of shoulder, the extreme cleanness of the shank, and the full rounded haunch, though every other part too has a perfection and a harmony unwitnessed (at least by my eyes) anywhere else. …The genuine Nejdean breed, so far as I have hitherto found, is to be met with only in Nejed itself; nor are these animals common even there; none but chiefs or individuals of considerable wealth and rank possess them. Nor are they ever sold, at least so all declare; and when I asked how then one could be acquired, “by war, by legacy, or by free gift,” was the answer. In this last manner alone is there a possibility of an isolated specimen leaving Nejed, but even that is seldom; and when policy requires a present to Egypt, Persia, or Constantinople (a circumstance of which I witnessed two instances and heard of others), mares are never sent, and the poorest stallions, though deserving to pass elsewhere for real beauties, are picked out for the purpose. …Nejdee horses are especially esteemed for great speed and endurance of fatigue, indeed, in this latter quality none come up to them. …. I often mounted them at the invitation of their owners, and without saddle, rein, or stirrup, set them off at full gallop, wheeled them round, brought them up in mid career at a dead halt, and that without the least difficulty or the smallest want of correspondence between the horse´s movements and my own will; the rider on their back really feels himself the man-half of a centaur, not a distinct being” (Palgrave, rendering prominent by the author).