It rather depends on the depth of the stillwater concerned, the range you are fishing and how tight the swim is. On the a more mature local commercials, I don't take a float rod other than my 9/11' combination float rod. However, I know that the depths are unlikely to exceed 5', plenty of the pegs have overhanging trees and I'll rarely have to chuck much more than ten yards. The club/syndicate stillwaters I frequent are far deeper, more open and I'm likely to fish at greater range. The 9/11' rods never even travels to those venues.
I'd say no to your question. However, if you narrowed it to the average commercial stillwater, the answer would probably be yes.