I used a bra on my first nsx and it was effective against errant stones. Keeping the inside clean can mitigate the "sanding effect." (The vehicle spent half it's time near the beach.) Abrasions can be buffed out, stone chips can not... and that was the basis for my policy of use.
After a decade of experience, I am more forgiving. You are faced with the reality of stone chips, like it or not. The one time you don't use the bra, is the time you get hit!
Take a look at your rocker panels. Stone chips? They probably look like the surface of the moon.
If I am using a truck route I use the bra. Otherwise, I don't.
It all comes down to reducing the impact of what is inevitable -- provided, of course, you drive the car!!
With touchup paint and 600 grit sandpaper, I can make a stone chip disappear -- practice developed this skill.
Be mellow and try the art of touchup. It is satisfying to know you can beat back time -- if just a bit.