I'm one of those other engineers who will use wood sheathing to brace steel beams in many cases. Some thoughts:
1) There are AISC provisions for checking bracing strength and stiffness as, no doubt, you are aware. Of course evaluating them isn't a ton of fun in wood.
2) It is very common to consider a steel roof beam to be braced by a steel roof deck running perpendicular. Is a steel deck really all that much stronger -- or stiffer - than a wood deck?
3) In most cases, you have wood framing spanning perpendicular to the steel beam. In those situations, I prefer to use that framing to brace the steel rather than the sheathing.
4) While the number of brace points provided doesn't alter the strength requirement at each brace point, it does alter the stiffness requirement. For the case of essentially continuous lateral restraint, the stiffness demand is rather small.
You may enjoy reviewing this recent, related thread:
Link
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.