If most of your pond is 6ft, cattails won't be growing in your pond. To determine if one wants cattails in their pond, one would have to decide the purposes of their pond. Cattails do not only have attractive fish cover, but attract assortment of other creatures. Muskrats tend to favor cattails to do dances to piss off pond owners.(They even, Possibly, make blowgun devices out reeds any other suitable materials)
I would assume any vegetation would be helpful around pond banks, not just the cattail.
Native americans ate many parts of the cattail back in the day. So the cattail does have many uses. Just keep the floating seed debris out of my eyes on a windy day.
