Agree, start without straps if you are not used to surfing (surf or windsurf waves)
You need to learn how different a directional works, so start strapless and in flat water or small waves, so you get to know how to "drive" a directional, and use the full board and the edges.
Very opposite technique than a TT, truly.
Later you can put the straps on and perform much more, and you know how to use the edges and board correct now
Or dont, continue strapless, if you feel better with that - personal likings and nothing but that