As a retired Architect who has been drawing for 50 years, I still have to remember that there are people who cannot read a map, let alone a working drawing,
and make allowances for it.
There are fewer and fewer all round model shops if there ever were many.
Ours in Oz seem to concentrate on one speciality, planes, cars, railways and occasionally, Boats.
I suppose that with the variety of items available for each hobby, it would be impossible for every Hobby shop to carry everything.
At least when one visits the shop, the sales person should know about the hobby they are catering for.