A traditionally good writer writes with flow, a smooth ease for the reader to glide across.
Roughness is a sign of bad writing, at least for most.
Roughness can be deliberate in the writer, a means of interrupting and drawing attention. A stutter in a rhythm draws confusion to a predetermined point, the writer orchestrates the readers attention.
A soft melody fades to the back of the mind, recalled at reference. The rough forces itself to front of the mind, forcing an awareness and a clarity.
A good writer chooses when a reader “reads” and reads.