Frankly, the kids working as "archery experts" in places like GM, Cabelas, etc, impress me more in their ignorance than any level of expertise. In particular, GM seems to consistently hire these arogant know it alls...
Quite often, they assume they know far more & better than the customer, and know better what he needs. That, and they don't bother to converse long enough to actually find out. Add to that the vast majority don't know jack about Trad archery & tackle...
Just in the last few months I overheard two instances of two different young men dispensing
goofy advice based on what they "know" because that's what they were told at some seminar put on by a bow company.
If I went to buy some nocks for alums and the sales-dweeb questioned why I didn't shoot carbon, I would have to tell him to pound sand and take my business elsewhere. And have done just that...
Both carbon and alums have pros & cons. I personally shoot both. I find alums easier to tune to a bow due to the more narrow spine attendent to each size. Alums are easier to build/fletch/work with. Their greater GPI weight without having to diddle around and add extra is an advantage for a Trad guy.
Carbons are tougher, period...
But hey, if you are getting the results you want with alums, I sure wouldn't change just because some sales dweeb at GM doesn't like em'...