Actually, amongst "modern" string materials, B-50 ranks at the bottom. Kinda' like a Model T, it was the stuff during it's time. Now it's more of a novelty.
Reason being is there are better materials available now. B-50 has the most stretch, most creep, least durability, least consistency of any manufactured string material on the market.
Even if you have to shoot polyester strings because you are shooting a self bow or an old bow that wasn't built for HMPE/HMPE blends, there's B-55. Not a huge improvement, but it is made with a higher grade of polyester for a little less stretch/creep and a little better durability.
No knocking anyone that likes it, just answering the question with verifiable facts. If you prefer B-50 for whatever reason, use it.