I'm guessing you're coming to pedal so you'll be just fine on your whatevever you bring.
We've had a few folded Alex rims on cheap XC valley trail rental bikes in the past, but Alex, liek all brands have some cheap tat. Presumably though, you didn't lace Alex's cheap rims to a nice set of hubs
Whistler does eat bike parts, but not so much with the XC riding. The bike park is a different beast.
Yes its technical xc riding but it wont take you long to figure out to ride over things as opposed to riding hard at them. You'll quickly work out good line choice and how to ride in a way that takes much less effort as if you don't, you'll give your body a hard time.
I'd also rather have DT hubs than Mavic any day.. seen too many dead mavic freehubs mid ride and thats no quick fix.
We have a high ratio of guests riding DH who have some sort of mechanical issue but a comparitively small number of XC guests needing to fix things.
If you are coming solely to ride the park.. leave the EX8 at home.
Whistler's valley bottom trails are starting to peak through the snow. Squamish's riding is superb right now and the loonie race season is nearly upon us!
Enjoy your trip!
Jonny @ Bear Back