Not true at all.
I guarantee that with topwater fly fishing I can keep my fly in productive water more than I can keep a topwater lure in in productive water.
...for subsurface, it can be a push, or close to it.
Not everyone makes a bunch of of false casts before putting the fly back in the water...A good fly angler pulls their bass streamer out of the water as soon as it clears good structure/cover, takes it into a back cast wile letting out line, executes a double haul, and drops the streamer right back into the water at the next spot....do that and even if they do make one or two false casts, each only takes a couple of seconds.
...and I was talking about how fussy it was...not saying it was the same.
That's a bunch of fun, and I'll do it when bass, pike, and musky fishing is slow...but I'll use a 6 wt. My 3 wt. hasn't been out of the rack except for practice casting in years.