Having, or not having, braced longbow visual tip reflex is only an aesthetic thing, no more or less.
IF a braced longbow exhibits ANY amount of "flip to the tips" it ain't a "D" shape R/D longbow. This is mostly a very visual thing as most mild R/D longbows still show some amount of tip reflex when braced. If it matters, and yer not sure, use a small straight edge to check a braced bows tips on its back and belly.
Again, it's just an AESTHETIC thing.
My RD longbow form produces a finished product that can have a slight reflex to the tip if braced real low depending on the length of the tip wedge.
. Years ago I built a few of these for long bow competitors where the officials actually used a straight edge at the tips to check them for qualification like Rob just mentioned.
What I did was shorten up the tip wedge an inch or so putting it in the form, or eliminated it completely . Then prior to installing the tip overlays I used another thin carbon overlay on the belly side like you see on a recurve limb, only I put it in a vise and straightened that last 4” of the tip and holds it there. takes the tiny reflex at the tip out completely.
But…. It still has a static tip that forces the energy storage to a shorter section of the limb, and increases performance nicely. Kirk