This paper from the WG21 Directions Group proposes guidelines to encourage earlier collaboration and convergence among C++ proposal authors, particularly for broad or high-impact features. It recommends that authors of competing or overlapping proposals communicate and attempt unification before consuming plenary time, seek review from generalists and long-tenure members, and include design scope rationale explaining general-purpose applicability. It also provides guidance for WG and SG chairs to act as facilitators who encourage convergence rather than gatekeepers.