Drilling is a disruptive process. Yes, I make that statement often, but it is true. As drillers and equipment operators, we have the opportunity to control the disruptive process and guarantee a successful bore. What if the damage done while finishing that bore prevents you from starting the next?
Think about how often you perform maintenance on the mud pump, fluid lines, valves and swivel. Do you keep a record? It is expected that undesirable solids will have an impact on downhole conditions and slow the drilling process. However, do you expect abrasive solids loading on that job to affect your next job? If your rig is down to replace the mud pumps every three months then yes, solids are affecting you more than just in the drilling phase.