The crosswind guidelines shown below were derived through flight test data and
engineering analysis. These crosswind guidelines are based on steady wind (no
gust) conditions and include all engines operating and engine inoperative. Gust
effects were evaluated and tend to increase pilot workload without significantly
affecting the recommended guidelines.
I see exactly the same in the 737 FCTM. In that case, as Intruder mentioned earlier, thats the correct way to interpret Mr Boeing.
Some operators DO include half the Gust in their XWIND component which brings you on the safe side. And strictly speaking.. strong winds usually come with gusts
Personally, I never had the pleasure of a "steady&strong" crosswind.
What failures and what model are you talking about, if you could be more specific?