Honestly, all jokes aside, it slides on easily and has caused no problems whatsoever. And my tube is not stretched or anything so unless I receive a better reason, I will continue to do what is making it easiest for me. I am in love with my reo and I would never put her in harms way.
I have several that are not glued and I have a few that are. You will know if you need to replace the tube or need to glue it if there is leaking from the top around the nipple when you squonk.