All right, if I had a dollar for every time I heard something so, ridiculous... Well, let's just say that I'd own my dream set by now.
To answer you... No! There is no reason why a Powerstroke-3 would not be compatible with a WOODEN SNARE.
Remo heads are inspired out of the roots of traditional drumming. Whoever wronged you about buying a powerstroke for your snare,obviously does not know enough about drumming to know that the first Remo heads were MADE to go on wooden sets... Sort of like, oh I don't know... TODAY.
By now you're probably thinking: "Gee Swiss, can't you back your argument up with something better?"
To this, I say- YES! I myself own a Gretsch Catalina (Maple) Ive had just about any and every type of head go on my 5.5" x 14" snare, from Evan's HD Dry to Remo's Emperor Coated-X.
Believe you me, as long as you have a good sense of direction as to what kind of sound you're looking for your set, you can use WHATEVER head you think would satisfy that preference.
Best of luck, and happy drumming!
- Juan