Bain & Co. said in a 2017 paper looking at the factors of successful and failed growth in business, that “Complexity is the silent killer of growth.” 
Increased complexity, especially in growing businesses, is a killer. As a business grows, the team spend more and more time managing themselves, rather than their clients.
New management layers and processes emerge that were once handled simply by a founding individual. The person who used to do that job as part of their original role, is now further away from that task than ever before.
Communication takes on a whole new meaning, with new groups, hierarchies and teams, each bringing their own fiefdoms and opportunities for further complexity. Meanwhile the very thing you set out to do originally is now not the thing you think about the most and spend the most time doing.
That’s not good for your business and it’s not a way to achieve sustainable growth, which is the key to winning long term.