Yeah if you have the space i certainly don't prefer to grow them this close. My backyard is tiny and I just dont have much to work with.
I was very happy with the results of the growth, the ease of removal, the rootsystems. And just as excited to get a closer look at this year's class with some of the big trees out. While these trees are monsters i've got a beautiful class of next trees I am already excited to watch take off this year.