Jack Dorsey is in reassembly mode at Block, the fintech company that owns the popular payment services Cash App and Square, as well as music streaming service Tidal. In a note to employees this week, Dorsey—Block’s CEO and cofounder—said the company’s internal reporting structure is getting an overhaul that will blow up the boundaries between various business lines, grouping employees together instead based on roles like engineering, design, and sales. “We’re going to reorganize our entire compa...