Having fished from a float tube, and from the shore, the shortest rod I ever owned was 6'10", my shortest rod I have now is 6'9", but I prefer a rod 7' or longer. Fishing from a float tube where your pretty restricted, you find ways to make longer rods work, i.e. pitching with a 7'6" rod, or casting a 8' swimbait rod with a 5 oz bait.
For me, a shorter rod, say 6'6" really isn't anymore accurate than my 7 footer.
Using the length of rod that suits you best regardless of what others use is the way to go.