Departing from current trends entails risks and uncertainties. These trends are often based on market demand, research, societal preferences, or opinion leader whims. Wherever these winds blow in from, they reflect the crowd's collective wisdom. By going against them, you may face higher risks and uncertainties. Questioning established norms can help you discover new and better ways of doing things, but it is a damn lonely business being true only to yourself.
"(B)uck the trends" suggests the somewhat arbitrary nature of reigning opinion, but also the precariousness of going against the flow.