The pipeline problem in a partnership is a time problem
In a product business the people selling and the people building are different people. In a professional services firm they are the same people, and every hour spent on a pursuit is an hour not billed. That single fact explains almost every pathology in services pipelines: the updates that happen late, the optimism that never gets corrected, the opportunities that stay open for a year, and the sudden scramble for work whenever a large engagement ends.
A routine that ignores this will not survive. What works is a small set of habits that cost senior people very little time and give them back a great deal: a named owner per opportunity, a stage model that requires evidence, an explicit decision about what the firm will and will not pursue, and one weekly meeting that looks at pipeline and capacity together rather than separately.