According to Arthur H Holmgren USU, the genus Tragopogon is perennial with fleshy taproots and grass like leaves. That being the case, yes, the first years roots would likely be more tender. Perhaps seed grown in a garden with good fertility and water would be better than the roadside plants I gathered? At any rate, from what I have seen of them, it is not likely I will ever plant any in my garden. I will enjoy the wild flowers.
Many things that grow naturally in this area are deemed edible, and many of the early settlers to the area used them regularly. I will assume it was a matter of survival in many cases, not that the item was particularly flavorful. IOW better to eat something than go hungry. (They didn't have a store around the corner, and likely no money to spend any way.)