A floating fly, minnow, shrimp, bug, etc. works great with sinking lines. Let the line go down to depth, and as you work the fly, it dives with the pull of the line.
I like to work bendbacks out of the kayak with my sinking lines.
In the surf, at least an intermediate is required to keep the line from wrapping you up with the wave action.
Casting is completely different from a floating line. You are not going to pull a backcast while the line is burried. Get the line to the surface with a roll cast of spiral cast, and only then can you pull the back cast.
These sinking lines are also a lot thinner than floaters, allowing you to cut through the wind.
Talk to Don H. He is a recent convert.
My 2 cents