Is having several desktop environments on one account bad?

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http://askubuntu.com – I have gnome classic, cinnamon, unity, gnome 3, and KDE installed on my only user account because I enjoy a little change from time to time (although my favorite is gnome classic) so I installed all of these desktop environments. I heard from a friend that it could potentially cause some problems. I was also told that it would be okay if I created a separate account for each environment, but I don't want to if I don't have to. Any help is much appreciated, thank you. (HowTos)